drivers/s390/scsi/zfcp_fsf.c

   1 /*
   2  * This file is part of the zfcp device driver for
   3  * FCP adapters for IBM System z9 and zSeries.
   4  *
   5  * (C) Copyright IBM Corp. 2002, 2006
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2, or (at your option)
  10  * any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include "zfcp_ext.h"
  23
  24 static int zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *);
  25 static void zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *);
  26 static int zfcp_fsf_open_port_handler(struct zfcp_fsf_req *);
  27 static int zfcp_fsf_close_port_handler(struct zfcp_fsf_req *);
  28 static int zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *);
  29 static int zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *);
  30 static int zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *);
  31 static int zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *);
  32 static int zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *);
  33 static int zfcp_fsf_send_fcp_command_task_management_handler(
  34         struct zfcp_fsf_req *);
  35 static int zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *);
  36 static int zfcp_fsf_status_read_handler(struct zfcp_fsf_req *);
  37 static int zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *);
  38 static int zfcp_fsf_send_els_handler(struct zfcp_fsf_req *);
  39 static int zfcp_fsf_control_file_handler(struct zfcp_fsf_req *);
  40 static inline int zfcp_fsf_req_sbal_check(
  41         unsigned long *, struct zfcp_qdio_queue *, int);
  42 static inline int zfcp_use_one_sbal(
  43         struct scatterlist *, int, struct scatterlist *, int);
  44 static struct zfcp_fsf_req *zfcp_fsf_req_alloc(mempool_t *, int);
  45 static int zfcp_fsf_req_send(struct zfcp_fsf_req *);
  46 static int zfcp_fsf_protstatus_eval(struct zfcp_fsf_req *);
  47 static int zfcp_fsf_fsfstatus_eval(struct zfcp_fsf_req *);
  48 static int zfcp_fsf_fsfstatus_qual_eval(struct zfcp_fsf_req *);
  49 static void zfcp_fsf_link_down_info_eval(struct zfcp_fsf_req *, u8,
  50         struct fsf_link_down_info *);
  51 static int zfcp_fsf_req_dispatch(struct zfcp_fsf_req *);
  52
  53 /* association between FSF command and FSF QTCB type */
  54 static u32 fsf_qtcb_type[] = {
  55         [FSF_QTCB_FCP_CMND] =             FSF_IO_COMMAND,
  56         [FSF_QTCB_ABORT_FCP_CMND] =       FSF_SUPPORT_COMMAND,
  57         [FSF_QTCB_OPEN_PORT_WITH_DID] =   FSF_SUPPORT_COMMAND,
  58         [FSF_QTCB_OPEN_LUN] =             FSF_SUPPORT_COMMAND,
  59         [FSF_QTCB_CLOSE_LUN] =            FSF_SUPPORT_COMMAND,
  60         [FSF_QTCB_CLOSE_PORT] =           FSF_SUPPORT_COMMAND,
  61         [FSF_QTCB_CLOSE_PHYSICAL_PORT] =  FSF_SUPPORT_COMMAND,
  62         [FSF_QTCB_SEND_ELS] =             FSF_SUPPORT_COMMAND,
  63         [FSF_QTCB_SEND_GENERIC] =         FSF_SUPPORT_COMMAND,
  64         [FSF_QTCB_EXCHANGE_CONFIG_DATA] = FSF_CONFIG_COMMAND,
  65         [FSF_QTCB_EXCHANGE_PORT_DATA] =   FSF_PORT_COMMAND,
  66         [FSF_QTCB_DOWNLOAD_CONTROL_FILE] = FSF_SUPPORT_COMMAND,
  67         [FSF_QTCB_UPLOAD_CONTROL_FILE] =  FSF_SUPPORT_COMMAND
  68 };
  69
  70 static const char zfcp_act_subtable_type[5][8] = {
  71         "unknown", "OS", "WWPN", "DID", "LUN"
  72 };
  73
  74 /****************************************************************/
  75 /*************** FSF related Functions  *************************/
  76 /****************************************************************/
  77
  78 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_FSF
  79
  80 /*
  81  * function:    zfcp_fsf_req_alloc
  82  *
  83  * purpose:     Obtains an fsf_req and potentially a qtcb (for all but
  84  *              unsolicited requests) via helper functions
  85  *              Does some initial fsf request set-up.
  86  *
  87  * returns:     pointer to allocated fsf_req if successfull
  88  *              NULL otherwise
  89  *
  90  * locks:       none
  91  *
  92  */
  93 static struct zfcp_fsf_req *
  94 zfcp_fsf_req_alloc(mempool_t *pool, int req_flags)
  95 {
  96         size_t size;
  97         void *ptr;
  98         struct zfcp_fsf_req *fsf_req = NULL;
  99
 100         if (req_flags & ZFCP_REQ_NO_QTCB)
 101                 size = sizeof(struct zfcp_fsf_req);
 102         else
 103                 size = sizeof(struct zfcp_fsf_req_qtcb);
 104
 105         if (likely(pool))
 106                 ptr = mempool_alloc(pool, GFP_ATOMIC);
 107         else {
 108                 if (req_flags & ZFCP_REQ_NO_QTCB)
 109                         ptr = kmalloc(size, GFP_ATOMIC);
 110                 else
 111                         ptr = kmem_cache_alloc(zfcp_data.fsf_req_qtcb_cache,
 112                                                GFP_ATOMIC);
 113         }
 114
 115         if (unlikely(!ptr))
 116                 goto out;
 117
 118         memset(ptr, 0, size);
 119
 120         if (req_flags & ZFCP_REQ_NO_QTCB) {
 121                 fsf_req = (struct zfcp_fsf_req *) ptr;
 122         } else {
 123                 fsf_req = &((struct zfcp_fsf_req_qtcb *) ptr)->fsf_req;
 124                 fsf_req->qtcb = &((struct zfcp_fsf_req_qtcb *) ptr)->qtcb;
 125         }
 126
 127         fsf_req->pool = pool;
 128
 129  out:
 130         return fsf_req;
 131 }
 132
 133 /*
 134  * function:    zfcp_fsf_req_free
 135  *
 136  * purpose:     Frees the memory of an fsf_req (and potentially a qtcb) or
 137  *              returns it into the pool via helper functions.
 138  *
 139  * returns:     sod all
 140  *
 141  * locks:       none
 142  */
 143 void
 144 zfcp_fsf_req_free(struct zfcp_fsf_req *fsf_req)
 145 {
 146         if (likely(fsf_req->pool)) {
 147                 mempool_free(fsf_req, fsf_req->pool);
 148                 return;
 149         }
 150
 151         if (fsf_req->qtcb) {
 152                 kmem_cache_free(zfcp_data.fsf_req_qtcb_cache, fsf_req);
 153                 return;
 154         }
 155
 156         kfree(fsf_req);
 157 }
 158
 159 /*
 160  * Never ever call this without shutting down the adapter first.
 161  * Otherwise the adapter would continue using and corrupting s390 storage.
 162  * Included BUG_ON() call to ensure this is done.
 163  * ERP is supposed to be the only user of this function.
 164  */
 165 void zfcp_fsf_req_dismiss_all(struct zfcp_adapter *adapter)
 166 {
 167         struct zfcp_fsf_req *fsf_req, *tmp;
 168         unsigned long flags;
 169         LIST_HEAD(remove_queue);
 170         unsigned int i;
 171
 172         BUG_ON(atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status));
 173         spin_lock_irqsave(&adapter->req_list_lock, flags);
 174         atomic_set(&adapter->reqs_active, 0);
 175         for (i = 0; i < REQUEST_LIST_SIZE; i++)
 176                 list_splice_init(&adapter->req_list[i], &remove_queue);
 177         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 178
 179         list_for_each_entry_safe(fsf_req, tmp, &remove_queue, list) {
 180                 list_del(&fsf_req->list);
 181                 fsf_req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
 182                 zfcp_fsf_req_complete(fsf_req);
 183         }
 184 }
 185
 186 /*
 187  * function:    zfcp_fsf_req_complete
 188  *
 189  * purpose:     Updates active counts and timers for openfcp-reqs
 190  *              May cleanup request after req_eval returns
 191  *
 192  * returns:     0 - success
 193  *              !0 - failure
 194  *
 195  * context:
 196  */
 197 int
 198 zfcp_fsf_req_complete(struct zfcp_fsf_req *fsf_req)
 199 {
 200         int retval = 0;
 201         int cleanup;
 202
 203         if (unlikely(fsf_req->fsf_command == FSF_QTCB_UNSOLICITED_STATUS)) {
 204                 ZFCP_LOG_DEBUG("Status read response received\n");
 205                 /*
 206                  * Note: all cleanup handling is done in the callchain of
 207                  * the function call-chain below.
 208                  */
 209                 zfcp_fsf_status_read_handler(fsf_req);
 210                 goto out;
 211         } else {
 212                 del_timer(&fsf_req->timer);
 213                 zfcp_fsf_protstatus_eval(fsf_req);
 214         }
 215
 216         /*
 217          * fsf_req may be deleted due to waking up functions, so
 218          * cleanup is saved here and used later
 219          */
 220         if (likely(fsf_req->status & ZFCP_STATUS_FSFREQ_CLEANUP))
 221                 cleanup = 1;
 222         else
 223                 cleanup = 0;
 224
 225         fsf_req->status |= ZFCP_STATUS_FSFREQ_COMPLETED;
 226
 227         /* cleanup request if requested by initiator */
 228         if (likely(cleanup)) {
 229                 ZFCP_LOG_TRACE("removing FSF request %p\n", fsf_req);
 230                 /*
 231                  * lock must not be held here since it will be
 232                  * grabed by the called routine, too
 233                  */
 234                 zfcp_fsf_req_free(fsf_req);
 235         } else {
 236                 /* notify initiator waiting for the requests completion */
 237                 ZFCP_LOG_TRACE("waking initiator of FSF request %p\n",fsf_req);
 238                 /*
 239                  * FIXME: Race! We must not access fsf_req here as it might have been
 240                  * cleaned up already due to the set ZFCP_STATUS_FSFREQ_COMPLETED
 241                  * flag. It's an improbable case. But, we have the same paranoia for
 242                  * the cleanup flag already.
 243                  * Might better be handled using complete()?
 244                  * (setting the flag and doing wakeup ought to be atomic
 245                  *  with regard to checking the flag as long as waitqueue is
 246                  *  part of the to be released structure)
 247                  */
 248                 wake_up(&fsf_req->completion_wq);
 249         }
 250
 251  out:
 252         return retval;
 253 }
 254
 255 /*
 256  * function:    zfcp_fsf_protstatus_eval
 257  *
 258  * purpose:     evaluates the QTCB of the finished FSF request
 259  *              and initiates appropriate actions
 260  *              (usually calling FSF command specific handlers)
 261  *
 262  * returns:
 263  *
 264  * context:
 265  *
 266  * locks:
 267  */
 268 static int
 269 zfcp_fsf_protstatus_eval(struct zfcp_fsf_req *fsf_req)
 270 {
 271         int retval = 0;
 272         struct zfcp_adapter *adapter = fsf_req->adapter;
 273         struct fsf_qtcb *qtcb = fsf_req->qtcb;
 274         union fsf_prot_status_qual *prot_status_qual =
 275                 &qtcb->prefix.prot_status_qual;
 276
 277         zfcp_hba_dbf_event_fsf_response(fsf_req);
 278
 279         if (fsf_req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
 280                 ZFCP_LOG_DEBUG("fsf_req 0x%lx has been dismissed\n",
 281                                (unsigned long) fsf_req);
 282                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
 283                         ZFCP_STATUS_FSFREQ_RETRY; /* only for SCSI cmnds. */
 284                 goto skip_protstatus;
 285         }
 286
 287         /* evaluate FSF Protocol Status */
 288         switch (qtcb->prefix.prot_status) {
 289
 290         case FSF_PROT_GOOD:
 291         case FSF_PROT_FSF_STATUS_PRESENTED:
 292                 break;
 293
 294         case FSF_PROT_QTCB_VERSION_ERROR:
 295                 ZFCP_LOG_NORMAL("error: The adapter %s contains "
 296                                 "microcode of version 0x%x, the device driver "
 297                                 "only supports 0x%x. Aborting.\n",
 298                                 zfcp_get_busid_by_adapter(adapter),
 299                                 prot_status_qual->version_error.fsf_version,
 300                                 ZFCP_QTCB_VERSION);
 301                 zfcp_erp_adapter_shutdown(adapter, 0, 117, (u64)fsf_req);
 302                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 303                 break;
 304
 305         case FSF_PROT_SEQ_NUMB_ERROR:
 306                 ZFCP_LOG_NORMAL("bug: Sequence number mismatch between "
 307                                 "driver (0x%x) and adapter %s (0x%x). "
 308                                 "Restarting all operations on this adapter.\n",
 309                                 qtcb->prefix.req_seq_no,
 310                                 zfcp_get_busid_by_adapter(adapter),
 311                                 prot_status_qual->sequence_error.exp_req_seq_no);
 312                 zfcp_erp_adapter_reopen(adapter, 0, 98, (u64)fsf_req);
 313                 fsf_req->status |= ZFCP_STATUS_FSFREQ_RETRY;
 314                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 315                 break;
 316
 317         case FSF_PROT_UNSUPP_QTCB_TYPE:
 318                 ZFCP_LOG_NORMAL("error: Packet header type used by the "
 319                                 "device driver is incompatible with "
 320                                 "that used on adapter %s. "
 321                                 "Stopping all operations on this adapter.\n",
 322                                 zfcp_get_busid_by_adapter(adapter));
 323                 zfcp_erp_adapter_shutdown(adapter, 0, 118, (u64)fsf_req);
 324                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 325                 break;
 326
 327         case FSF_PROT_HOST_CONNECTION_INITIALIZING:
 328                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 329                 atomic_set_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 330                                 &(adapter->status));
 331                 break;
 332
 333         case FSF_PROT_DUPLICATE_REQUEST_ID:
 334                         ZFCP_LOG_NORMAL("bug: The request identifier 0x%Lx "
 335                                         "to the adapter %s is ambiguous. "
 336                                 "Stopping all operations on this adapter.\n",
 337                                 *(unsigned long long*)
 338                                 (&qtcb->bottom.support.req_handle),
 339                                         zfcp_get_busid_by_adapter(adapter));
 340                 zfcp_erp_adapter_shutdown(adapter, 0, 78, (u64)fsf_req);
 341                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 342                 break;
 343
 344         case FSF_PROT_LINK_DOWN:
 345                 zfcp_fsf_link_down_info_eval(fsf_req, 37,
 346                                              &prot_status_qual->link_down_info);
 347                 /* FIXME: reopening adapter now? better wait for link up */
 348                 zfcp_erp_adapter_reopen(adapter, 0, 79, (u64)fsf_req);
 349                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 350                 break;
 351
 352         case FSF_PROT_REEST_QUEUE:
 353                 ZFCP_LOG_NORMAL("The local link to adapter with "
 354                               "%s was re-plugged. "
 355                               "Re-starting operations on this adapter.\n",
 356                               zfcp_get_busid_by_adapter(adapter));
 357                 /* All ports should be marked as ready to run again */
 358                 zfcp_erp_modify_adapter_status(adapter, 28,
 359                                                0, ZFCP_STATUS_COMMON_RUNNING,
 360                                                ZFCP_SET);
 361                 zfcp_erp_adapter_reopen(adapter,
 362                                         ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED
 363                                         | ZFCP_STATUS_COMMON_ERP_FAILED,
 364                                         99, (u64)fsf_req);
 365                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 366                 break;
 367
 368         case FSF_PROT_ERROR_STATE:
 369                 ZFCP_LOG_NORMAL("error: The adapter %s "
 370                                 "has entered the error state. "
 371                                 "Restarting all operations on this "
 372                                 "adapter.\n",
 373                                 zfcp_get_busid_by_adapter(adapter));
 374                 zfcp_erp_adapter_reopen(adapter, 0, 100, (u64)fsf_req);
 375                 fsf_req->status |= ZFCP_STATUS_FSFREQ_RETRY;
 376                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 377                 break;
 378
 379         default:
 380                 ZFCP_LOG_NORMAL("bug: Transfer protocol status information "
 381                                 "provided by the adapter %s "
 382                                 "is not compatible with the device driver. "
 383                                 "Stopping all operations on this adapter. "
 384                                 "(debug info 0x%x).\n",
 385                                 zfcp_get_busid_by_adapter(adapter),
 386                                 qtcb->prefix.prot_status);
 387                 zfcp_erp_adapter_shutdown(adapter, 0, 119, (u64)fsf_req);
 388                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 389         }
 390
 391  skip_protstatus:
 392         /*
 393          * always call specific handlers to give them a chance to do
 394          * something meaningful even in error cases
 395          */
 396         zfcp_fsf_fsfstatus_eval(fsf_req);
 397         return retval;
 398 }
 399
 400 /*
 401  * function:    zfcp_fsf_fsfstatus_eval
 402  *
 403  * purpose:     evaluates FSF status of completed FSF request
 404  *              and acts accordingly
 405  *
 406  * returns:
 407  */
 408 static int
 409 zfcp_fsf_fsfstatus_eval(struct zfcp_fsf_req *fsf_req)
 410 {
 411         int retval = 0;
 412
 413         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
 414                 goto skip_fsfstatus;
 415         }
 416
 417         /* evaluate FSF Status */
 418         switch (fsf_req->qtcb->header.fsf_status) {
 419         case FSF_UNKNOWN_COMMAND:
 420                 ZFCP_LOG_NORMAL("bug: Command issued by the device driver is "
 421                                 "not known by the adapter %s "
 422                                 "Stopping all operations on this adapter. "
 423                                 "(debug info 0x%x).\n",
 424                                 zfcp_get_busid_by_adapter(fsf_req->adapter),
 425                                 fsf_req->qtcb->header.fsf_command);
 426                 zfcp_erp_adapter_shutdown(fsf_req->adapter, 0, 120,
 427                                           (u64)fsf_req);
 428                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 429                 break;
 430
 431         case FSF_FCP_RSP_AVAILABLE:
 432                 ZFCP_LOG_DEBUG("FCP Sense data will be presented to the "
 433                                "SCSI stack.\n");
 434                 break;
 435
 436         case FSF_ADAPTER_STATUS_AVAILABLE:
 437                 zfcp_fsf_fsfstatus_qual_eval(fsf_req);
 438                 break;
 439         }
 440
 441  skip_fsfstatus:
 442         /*
 443          * always call specific handlers to give them a chance to do
 444          * something meaningful even in error cases
 445          */
 446         zfcp_fsf_req_dispatch(fsf_req);
 447
 448         return retval;
 449 }
 450
 451 /*
 452  * function:    zfcp_fsf_fsfstatus_qual_eval
 453  *
 454  * purpose:     evaluates FSF status-qualifier of completed FSF request
 455  *              and acts accordingly
 456  *
 457  * returns:
 458  */
 459 static int
 460 zfcp_fsf_fsfstatus_qual_eval(struct zfcp_fsf_req *fsf_req)
 461 {
 462         int retval = 0;
 463
 464         switch (fsf_req->qtcb->header.fsf_status_qual.word[0]) {
 465         case FSF_SQ_FCP_RSP_AVAILABLE:
 466                 break;
 467         case FSF_SQ_RETRY_IF_POSSIBLE:
 468                 /* The SCSI-stack may now issue retries or escalate */
 469                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 470                 break;
 471         case FSF_SQ_COMMAND_ABORTED:
 472                 /* Carry the aborted state on to upper layer */
 473                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTED;
 474                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 475                 break;
 476         case FSF_SQ_NO_RECOM:
 477                 ZFCP_LOG_NORMAL("bug: No recommendation could be given for a "
 478                                 "problem on the adapter %s "
 479                                 "Stopping all operations on this adapter. ",
 480                                 zfcp_get_busid_by_adapter(fsf_req->adapter));
 481                 zfcp_erp_adapter_shutdown(fsf_req->adapter, 0, 121,
 482                                           (u64)fsf_req);
 483                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 484                 break;
 485         case FSF_SQ_ULP_PROGRAMMING_ERROR:
 486                 ZFCP_LOG_NORMAL("error: not enough SBALs for data transfer "
 487                                 "(adapter %s)\n",
 488                                 zfcp_get_busid_by_adapter(fsf_req->adapter));
 489                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 490                 break;
 491         case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 492         case FSF_SQ_NO_RETRY_POSSIBLE:
 493         case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 494                 /* dealt with in the respective functions */
 495                 break;
 496         default:
 497                 ZFCP_LOG_NORMAL("bug: Additional status info could "
 498                                 "not be interpreted properly.\n");
 499                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
 500                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
 501                               sizeof (union fsf_status_qual));
 502                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 503                 break;
 504         }
 505
 506         return retval;
 507 }
 508
 509 /**
 510  * zfcp_fsf_link_down_info_eval - evaluate link down information block
 511  */
 512 static void
 513 zfcp_fsf_link_down_info_eval(struct zfcp_fsf_req *fsf_req, u8 id,
 514                              struct fsf_link_down_info *link_down)
 515 {
 516         struct zfcp_adapter *adapter = fsf_req->adapter;
 517
 518         if (atomic_test_mask(ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
 519                              &adapter->status))
 520                 return;
 521
 522         atomic_set_mask(ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
 523
 524         if (link_down == NULL)
 525                 goto out;
 526
 527         switch (link_down->error_code) {
 528         case FSF_PSQ_LINK_NO_LIGHT:
 529                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 530                                 "(no light detected)\n",
 531                                 zfcp_get_busid_by_adapter(adapter));
 532                 break;
 533         case FSF_PSQ_LINK_WRAP_PLUG:
 534                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 535                                 "(wrap plug detected)\n",
 536                                 zfcp_get_busid_by_adapter(adapter));
 537                 break;
 538         case FSF_PSQ_LINK_NO_FCP:
 539                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 540                                 "(adjacent node on link does not support FCP)\n",
 541                                 zfcp_get_busid_by_adapter(adapter));
 542                 break;
 543         case FSF_PSQ_LINK_FIRMWARE_UPDATE:
 544                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 545                                 "(firmware update in progress)\n",
 546                                 zfcp_get_busid_by_adapter(adapter));
 547                         break;
 548         case FSF_PSQ_LINK_INVALID_WWPN:
 549                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 550                                 "(duplicate or invalid WWPN detected)\n",
 551                                 zfcp_get_busid_by_adapter(adapter));
 552                 break;
 553         case FSF_PSQ_LINK_NO_NPIV_SUPPORT:
 554                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 555                                 "(no support for NPIV by Fabric)\n",
 556                                 zfcp_get_busid_by_adapter(adapter));
 557                 break;
 558         case FSF_PSQ_LINK_NO_FCP_RESOURCES:
 559                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 560                                 "(out of resource in FCP daughtercard)\n",
 561                                 zfcp_get_busid_by_adapter(adapter));
 562                 break;
 563         case FSF_PSQ_LINK_NO_FABRIC_RESOURCES:
 564                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 565                                 "(out of resource in Fabric)\n",
 566                                 zfcp_get_busid_by_adapter(adapter));
 567                 break;
 568         case FSF_PSQ_LINK_FABRIC_LOGIN_UNABLE:
 569                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 570                                 "(unable to Fabric login)\n",
 571                                 zfcp_get_busid_by_adapter(adapter));
 572                 break;
 573         case FSF_PSQ_LINK_WWPN_ASSIGNMENT_CORRUPTED:
 574                 ZFCP_LOG_NORMAL("WWPN assignment file corrupted on adapter %s\n",
 575                                 zfcp_get_busid_by_adapter(adapter));
 576                 break;
 577         case FSF_PSQ_LINK_MODE_TABLE_CURRUPTED:
 578                 ZFCP_LOG_NORMAL("Mode table corrupted on adapter %s\n",
 579                                 zfcp_get_busid_by_adapter(adapter));
 580                 break;
 581         case FSF_PSQ_LINK_NO_WWPN_ASSIGNMENT:
 582                 ZFCP_LOG_NORMAL("No WWPN for assignment table on adapter %s\n",
 583                                 zfcp_get_busid_by_adapter(adapter));
 584                 break;
 585         default:
 586                 ZFCP_LOG_NORMAL("The local link to adapter %s is down "
 587                                 "(warning: unknown reason code %d)\n",
 588                                 zfcp_get_busid_by_adapter(adapter),
 589                                 link_down->error_code);
 590         }
 591
 592         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
 593                 ZFCP_LOG_DEBUG("Debug information to link down: "
 594                                "primary_status=0x%02x "
 595                                "ioerr_code=0x%02x "
 596                                "action_code=0x%02x "
 597                                "reason_code=0x%02x "
 598                                "explanation_code=0x%02x "
 599                                "vendor_specific_code=0x%02x\n",
 600                                 link_down->primary_status,
 601                                 link_down->ioerr_code,
 602                                 link_down->action_code,
 603                                 link_down->reason_code,
 604                                 link_down->explanation_code,
 605                                 link_down->vendor_specific_code);
 606
 607  out:
 608         zfcp_erp_adapter_failed(adapter, id, (u64)fsf_req);
 609 }
 610
 611 /*
 612  * function:    zfcp_fsf_req_dispatch
 613  *
 614  * purpose:     calls the appropriate command specific handler
 615  *
 616  * returns:
 617  */
 618 static int
 619 zfcp_fsf_req_dispatch(struct zfcp_fsf_req *fsf_req)
 620 {
 621         struct zfcp_erp_action *erp_action = fsf_req->erp_action;
 622         struct zfcp_adapter *adapter = fsf_req->adapter;
 623         int retval = 0;
 624
 625
 626         switch (fsf_req->fsf_command) {
 627
 628         case FSF_QTCB_FCP_CMND:
 629                 zfcp_fsf_send_fcp_command_handler(fsf_req);
 630                 break;
 631
 632         case FSF_QTCB_ABORT_FCP_CMND:
 633                 zfcp_fsf_abort_fcp_command_handler(fsf_req);
 634                 break;
 635
 636         case FSF_QTCB_SEND_GENERIC:
 637                 zfcp_fsf_send_ct_handler(fsf_req);
 638                 break;
 639
 640         case FSF_QTCB_OPEN_PORT_WITH_DID:
 641                 zfcp_fsf_open_port_handler(fsf_req);
 642                 break;
 643
 644         case FSF_QTCB_OPEN_LUN:
 645                 zfcp_fsf_open_unit_handler(fsf_req);
 646                 break;
 647
 648         case FSF_QTCB_CLOSE_LUN:
 649                 zfcp_fsf_close_unit_handler(fsf_req);
 650                 break;
 651
 652         case FSF_QTCB_CLOSE_PORT:
 653                 zfcp_fsf_close_port_handler(fsf_req);
 654                 break;
 655
 656         case FSF_QTCB_CLOSE_PHYSICAL_PORT:
 657                 zfcp_fsf_close_physical_port_handler(fsf_req);
 658                 break;
 659
 660         case FSF_QTCB_EXCHANGE_CONFIG_DATA:
 661                 zfcp_fsf_exchange_config_data_handler(fsf_req);
 662                 break;
 663
 664         case FSF_QTCB_EXCHANGE_PORT_DATA:
 665                 zfcp_fsf_exchange_port_data_handler(fsf_req);
 666                 break;
 667
 668         case FSF_QTCB_SEND_ELS:
 669                 zfcp_fsf_send_els_handler(fsf_req);
 670                 break;
 671
 672         case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
 673                 zfcp_fsf_control_file_handler(fsf_req);
 674                 break;
 675
 676         case FSF_QTCB_UPLOAD_CONTROL_FILE:
 677                 zfcp_fsf_control_file_handler(fsf_req);
 678                 break;
 679
 680         default:
 681                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 682                 ZFCP_LOG_NORMAL("bug: Command issued by the device driver is "
 683                                 "not supported by the adapter %s\n",
 684                                 zfcp_get_busid_by_adapter(adapter));
 685                 if (fsf_req->fsf_command != fsf_req->qtcb->header.fsf_command)
 686                         ZFCP_LOG_NORMAL
 687                             ("bug: Command issued by the device driver differs "
 688                              "from the command returned by the adapter %s "
 689                              "(debug info 0x%x, 0x%x).\n",
 690                              zfcp_get_busid_by_adapter(adapter),
 691                              fsf_req->fsf_command,
 692                              fsf_req->qtcb->header.fsf_command);
 693         }
 694
 695         if (!erp_action)
 696                 return retval;
 697
 698         zfcp_erp_async_handler(erp_action, 0);
 699
 700         return retval;
 701 }
 702
 703 /*
 704  * function:    zfcp_fsf_status_read
 705  *
 706  * purpose:     initiates a Status Read command at the specified adapter
 707  *
 708  * returns:
 709  */
 710 int
 711 zfcp_fsf_status_read(struct zfcp_adapter *adapter, int req_flags)
 712 {
 713         struct zfcp_fsf_req *fsf_req;
 714         struct fsf_status_read_buffer *status_buffer;
 715         unsigned long lock_flags;
 716         volatile struct qdio_buffer_element *sbale;
 717         int retval = 0;
 718
 719         /* setup new FSF request */
 720         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_UNSOLICITED_STATUS,
 721                                      req_flags | ZFCP_REQ_NO_QTCB,
 722                                      adapter->pool.fsf_req_status_read,
 723                                      &lock_flags, &fsf_req);
 724         if (retval < 0) {
 725                 ZFCP_LOG_INFO("error: Could not create unsolicited status "
 726                               "buffer for adapter %s.\n",
 727                               zfcp_get_busid_by_adapter(adapter));
 728                 goto failed_req_create;
 729         }
 730
 731         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
 732         sbale[0].flags |= SBAL_FLAGS0_TYPE_STATUS;
 733         sbale[2].flags |= SBAL_FLAGS_LAST_ENTRY;
 734         fsf_req->sbale_curr = 2;
 735
 736         status_buffer =
 737                 mempool_alloc(adapter->pool.data_status_read, GFP_ATOMIC);
 738         if (!status_buffer) {
 739                 ZFCP_LOG_NORMAL("bug: could not get some buffer\n");
 740                 goto failed_buf;
 741         }
 742         memset(status_buffer, 0, sizeof (struct fsf_status_read_buffer));
 743         fsf_req->data = (unsigned long) status_buffer;
 744
 745         /* insert pointer to respective buffer */
 746         sbale = zfcp_qdio_sbale_curr(fsf_req);
 747         sbale->addr = (void *) status_buffer;
 748         sbale->length = sizeof(struct fsf_status_read_buffer);
 749
 750         retval = zfcp_fsf_req_send(fsf_req);
 751         if (retval) {
 752                 ZFCP_LOG_DEBUG("error: Could not set-up unsolicited status "
 753                                "environment.\n");
 754                 goto failed_req_send;
 755         }
 756
 757         ZFCP_LOG_TRACE("Status Read request initiated (adapter%s)\n",
 758                        zfcp_get_busid_by_adapter(adapter));
 759         goto out;
 760
 761  failed_req_send:
 762         mempool_free(status_buffer, adapter->pool.data_status_read);
 763
 764  failed_buf:
 765         zfcp_fsf_req_free(fsf_req);
 766  failed_req_create:
 767         zfcp_hba_dbf_event_fsf_unsol("fail", adapter, NULL);
 768  out:
 769         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
 770         return retval;
 771 }
 772
 773 static int
 774 zfcp_fsf_status_read_port_closed(struct zfcp_fsf_req *fsf_req)
 775 {
 776         struct fsf_status_read_buffer *status_buffer;
 777         struct zfcp_adapter *adapter;
 778         struct zfcp_port *port;
 779         unsigned long flags;
 780
 781         status_buffer = (struct fsf_status_read_buffer *) fsf_req->data;
 782         adapter = fsf_req->adapter;
 783
 784         read_lock_irqsave(&zfcp_data.config_lock, flags);
 785         list_for_each_entry(port, &adapter->port_list_head, list)
 786             if (port->d_id == (status_buffer->d_id & ZFCP_DID_MASK))
 787                 break;
 788         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 789
 790         if (!port || (port->d_id != (status_buffer->d_id & ZFCP_DID_MASK))) {
 791                 ZFCP_LOG_NORMAL("bug: Reopen port indication received for "
 792                                 "nonexisting port with d_id 0x%06x on "
 793                                 "adapter %s. Ignored.\n",
 794                                 status_buffer->d_id & ZFCP_DID_MASK,
 795                                 zfcp_get_busid_by_adapter(adapter));
 796                 goto out;
 797         }
 798
 799         switch (status_buffer->status_subtype) {
 800
 801         case FSF_STATUS_READ_SUB_CLOSE_PHYS_PORT:
 802                 zfcp_erp_port_reopen(port, 0, 101, (u64)fsf_req);
 803                 break;
 804
 805         case FSF_STATUS_READ_SUB_ERROR_PORT:
 806                 zfcp_erp_port_shutdown(port, 0, 122, (u64)fsf_req);
 807                 break;
 808
 809         default:
 810                 ZFCP_LOG_NORMAL("bug: Undefined status subtype received "
 811                                 "for a reopen indication on port with "
 812                                 "d_id 0x%06x on the adapter %s. "
 813                                 "Ignored. (debug info 0x%x)\n",
 814                                 status_buffer->d_id,
 815                                 zfcp_get_busid_by_adapter(adapter),
 816                                 status_buffer->status_subtype);
 817         }
 818  out:
 819         return 0;
 820 }
 821
 822 /*
 823  * function:    zfcp_fsf_status_read_handler
 824  *
 825  * purpose:     is called for finished Open Port command
 826  *
 827  * returns:
 828  */
 829 static int
 830 zfcp_fsf_status_read_handler(struct zfcp_fsf_req *fsf_req)
 831 {
 832         int retval = 0;
 833         struct zfcp_adapter *adapter = fsf_req->adapter;
 834         struct fsf_status_read_buffer *status_buffer =
 835                 (struct fsf_status_read_buffer *) fsf_req->data;
 836         struct fsf_bit_error_payload *fsf_bit_error;
 837
 838         if (fsf_req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
 839                 zfcp_hba_dbf_event_fsf_unsol("dism", adapter, status_buffer);
 840                 mempool_free(status_buffer, adapter->pool.data_status_read);
 841                 zfcp_fsf_req_free(fsf_req);
 842                 goto out;
 843         }
 844
 845         zfcp_hba_dbf_event_fsf_unsol("read", adapter, status_buffer);
 846
 847         switch (status_buffer->status_type) {
 848
 849         case FSF_STATUS_READ_PORT_CLOSED:
 850                 zfcp_fsf_status_read_port_closed(fsf_req);
 851                 break;
 852
 853         case FSF_STATUS_READ_INCOMING_ELS:
 854                 zfcp_fsf_incoming_els(fsf_req);
 855                 break;
 856
 857         case FSF_STATUS_READ_SENSE_DATA_AVAIL:
 858                 ZFCP_LOG_INFO("unsolicited sense data received (adapter %s)\n",
 859                               zfcp_get_busid_by_adapter(adapter));
 860                 break;
 861
 862         case FSF_STATUS_READ_BIT_ERROR_THRESHOLD:
 863                 fsf_bit_error = (struct fsf_bit_error_payload *)
 864                         status_buffer->payload;
 865                 ZFCP_LOG_NORMAL("Warning: bit error threshold data "
 866                     "received (adapter %s, "
 867                     "link failures = %i, loss of sync errors = %i, "
 868                     "loss of signal errors = %i, "
 869                     "primitive sequence errors = %i, "
 870                     "invalid transmission word errors = %i, "
 871                     "CRC errors = %i)\n",
 872                     zfcp_get_busid_by_adapter(adapter),
 873                     fsf_bit_error->link_failure_error_count,
 874                     fsf_bit_error->loss_of_sync_error_count,
 875                     fsf_bit_error->loss_of_signal_error_count,
 876                     fsf_bit_error->primitive_sequence_error_count,
 877                     fsf_bit_error->invalid_transmission_word_error_count,
 878                     fsf_bit_error->crc_error_count);
 879                 ZFCP_LOG_INFO("Additional bit error threshold data "
 880                     "(adapter %s, "
 881                     "primitive sequence event time-outs = %i, "
 882                     "elastic buffer overrun errors = %i, "
 883                     "advertised receive buffer-to-buffer credit = %i, "
 884                     "current receice buffer-to-buffer credit = %i, "
 885                     "advertised transmit buffer-to-buffer credit = %i, "
 886                     "current transmit buffer-to-buffer credit = %i)\n",
 887                     zfcp_get_busid_by_adapter(adapter),
 888                     fsf_bit_error->primitive_sequence_event_timeout_count,
 889                     fsf_bit_error->elastic_buffer_overrun_error_count,
 890                     fsf_bit_error->advertised_receive_b2b_credit,
 891                     fsf_bit_error->current_receive_b2b_credit,
 892                     fsf_bit_error->advertised_transmit_b2b_credit,
 893                     fsf_bit_error->current_transmit_b2b_credit);
 894                 break;
 895
 896         case FSF_STATUS_READ_LINK_DOWN:
 897                 switch (status_buffer->status_subtype) {
 898                 case FSF_STATUS_READ_SUB_NO_PHYSICAL_LINK:
 899                         ZFCP_LOG_INFO("Physical link to adapter %s is down\n",
 900                                       zfcp_get_busid_by_adapter(adapter));
 901                         zfcp_fsf_link_down_info_eval(fsf_req, 38,
 902                                 (struct fsf_link_down_info *)
 903                                 &status_buffer->payload);
 904                         break;
 905                 case FSF_STATUS_READ_SUB_FDISC_FAILED:
 906                         ZFCP_LOG_INFO("Local link to adapter %s is down "
 907                                       "due to failed FDISC login\n",
 908                                       zfcp_get_busid_by_adapter(adapter));
 909                         zfcp_fsf_link_down_info_eval(fsf_req, 39,
 910                                 (struct fsf_link_down_info *)
 911                                 &status_buffer->payload);
 912                         break;
 913                 case FSF_STATUS_READ_SUB_FIRMWARE_UPDATE:
 914                         ZFCP_LOG_INFO("Local link to adapter %s is down "
 915                                       "due to firmware update on adapter\n",
 916                                       zfcp_get_busid_by_adapter(adapter));
 917                         zfcp_fsf_link_down_info_eval(fsf_req, 40, NULL);
 918                         break;
 919                 default:
 920                         ZFCP_LOG_INFO("Local link to adapter %s is down "
 921                                       "due to unknown reason\n",
 922                                       zfcp_get_busid_by_adapter(adapter));
 923                         zfcp_fsf_link_down_info_eval(fsf_req, 41, NULL);
 924                 };
 925                 break;
 926
 927         case FSF_STATUS_READ_LINK_UP:
 928                 ZFCP_LOG_NORMAL("Local link to adapter %s was replugged. "
 929                                 "Restarting operations on this adapter\n",
 930                                 zfcp_get_busid_by_adapter(adapter));
 931                 /* All ports should be marked as ready to run again */
 932                 zfcp_erp_modify_adapter_status(adapter, 30, 0,
 933                                                ZFCP_STATUS_COMMON_RUNNING,
 934                                                ZFCP_SET);
 935                 zfcp_erp_adapter_reopen(adapter,
 936                                         ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED
 937                                         | ZFCP_STATUS_COMMON_ERP_FAILED,
 938                                         102, (u64)fsf_req);
 939                 break;
 940
 941         case FSF_STATUS_READ_NOTIFICATION_LOST:
 942                 ZFCP_LOG_NORMAL("Unsolicited status notification(s) lost: "
 943                                 "adapter %s%s%s%s%s%s%s%s%s\n",
 944                                 zfcp_get_busid_by_adapter(adapter),
 945                                 (status_buffer->status_subtype &
 946                                         FSF_STATUS_READ_SUB_INCOMING_ELS) ?
 947                                         ", incoming ELS" : "",
 948                                 (status_buffer->status_subtype &
 949                                         FSF_STATUS_READ_SUB_SENSE_DATA) ?
 950                                         ", sense data" : "",
 951                                 (status_buffer->status_subtype &
 952                                         FSF_STATUS_READ_SUB_LINK_STATUS) ?
 953                                         ", link status change" : "",
 954                                 (status_buffer->status_subtype &
 955                                         FSF_STATUS_READ_SUB_PORT_CLOSED) ?
 956                                         ", port close" : "",
 957                                 (status_buffer->status_subtype &
 958                                         FSF_STATUS_READ_SUB_BIT_ERROR_THRESHOLD) ?
 959                                         ", bit error exception" : "",
 960                                 (status_buffer->status_subtype &
 961                                         FSF_STATUS_READ_SUB_ACT_UPDATED) ?
 962                                         ", ACT update" : "",
 963                                 (status_buffer->status_subtype &
 964                                         FSF_STATUS_READ_SUB_ACT_HARDENED) ?
 965                                         ", ACT hardening" : "",
 966                                 (status_buffer->status_subtype &
 967                                         FSF_STATUS_READ_SUB_FEATURE_UPDATE_ALERT) ?
 968                                         ", adapter feature change" : "");
 969
 970                 if (status_buffer->status_subtype &
 971                     FSF_STATUS_READ_SUB_ACT_UPDATED)
 972                         zfcp_erp_adapter_access_changed(adapter, 135,
 973                                                         (u64)fsf_req);
 974                 break;
 975
 976         case FSF_STATUS_READ_CFDC_UPDATED:
 977                 ZFCP_LOG_NORMAL("CFDC has been updated on the adapter %s\n",
 978                               zfcp_get_busid_by_adapter(adapter));
 979                 zfcp_erp_adapter_access_changed(adapter, 136, (u64)fsf_req);
 980                 break;
 981
 982         case FSF_STATUS_READ_CFDC_HARDENED:
 983                 switch (status_buffer->status_subtype) {
 984                 case FSF_STATUS_READ_SUB_CFDC_HARDENED_ON_SE:
 985                         ZFCP_LOG_NORMAL("CFDC of adapter %s saved on SE\n",
 986                                       zfcp_get_busid_by_adapter(adapter));
 987                         break;
 988                 case FSF_STATUS_READ_SUB_CFDC_HARDENED_ON_SE2:
 989                         ZFCP_LOG_NORMAL("CFDC of adapter %s has been copied "
 990                                       "to the secondary SE\n",
 991                                 zfcp_get_busid_by_adapter(adapter));
 992                         break;
 993                 default:
 994                         ZFCP_LOG_NORMAL("CFDC of adapter %s has been hardened\n",
 995                                       zfcp_get_busid_by_adapter(adapter));
 996                 }
 997                 break;
 998
 999         case FSF_STATUS_READ_FEATURE_UPDATE_ALERT:
1000                 ZFCP_LOG_INFO("List of supported features on adapter %s has "
1001                               "been changed from 0x%08X to 0x%08X\n",
1002                               zfcp_get_busid_by_adapter(adapter),
1003                               *(u32*) (status_buffer->payload + 4),
1004                               *(u32*) (status_buffer->payload));
1005                 adapter->adapter_features = *(u32*) status_buffer->payload;
1006                 break;
1007
1008         default:
1009                 ZFCP_LOG_NORMAL("warning: An unsolicited status packet of unknown "
1010                                 "type was received (debug info 0x%x)\n",
1011                                 status_buffer->status_type);
1012                 ZFCP_LOG_DEBUG("Dump of status_read_buffer %p:\n",
1013                                status_buffer);
1014                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
1015                               (char *) status_buffer,
1016                               sizeof (struct fsf_status_read_buffer));
1017                 break;
1018         }
1019         mempool_free(status_buffer, adapter->pool.data_status_read);
1020         zfcp_fsf_req_free(fsf_req);
1021         /*
1022          * recycle buffer and start new request repeat until outbound
1023          * queue is empty or adapter shutdown is requested
1024          */
1025         /*
1026          * FIXME(qdio):
1027          * we may wait in the req_create for 5s during shutdown, so
1028          * qdio_cleanup will have to wait at least that long before returning
1029          * with failure to allow us a proper cleanup under all circumstances
1030          */
1031         /*
1032          * FIXME:
1033          * allocation failure possible? (Is this code needed?)
1034          */
1035         retval = zfcp_fsf_status_read(adapter, 0);
1036         if (retval < 0) {
1037                 ZFCP_LOG_INFO("Failed to create unsolicited status read "
1038                               "request for the adapter %s.\n",
1039                               zfcp_get_busid_by_adapter(adapter));
1040                 /* temporary fix to avoid status read buffer shortage */
1041                 adapter->status_read_failed++;
1042                 if ((ZFCP_STATUS_READS_RECOM - adapter->status_read_failed)
1043                     < ZFCP_STATUS_READ_FAILED_THRESHOLD) {
1044                         ZFCP_LOG_INFO("restart adapter %s due to status read "
1045                                       "buffer shortage\n",
1046                                       zfcp_get_busid_by_adapter(adapter));
1047                         zfcp_erp_adapter_reopen(adapter, 0, 103, (u64)fsf_req);
1048                 }
1049         }
1050  out:
1051         return retval;
1052 }
1053
1054 /*
1055  * function:    zfcp_fsf_abort_fcp_command
1056  *
1057  * purpose:     tells FSF to abort a running SCSI command
1058  *
1059  * returns:     address of initiated FSF request
1060  *              NULL - request could not be initiated
1061  *
1062  * FIXME(design): should be watched by a timeout !!!
1063  * FIXME(design) shouldn't this be modified to return an int
1064  *               also...don't know how though
1065  */
1066 struct zfcp_fsf_req *
1067 zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
1068                            struct zfcp_adapter *adapter,
1069                            struct zfcp_unit *unit, int req_flags)
1070 {
1071         volatile struct qdio_buffer_element *sbale;
1072         struct zfcp_fsf_req *fsf_req = NULL;
1073         unsigned long lock_flags;
1074         int retval = 0;
1075
1076         /* setup new FSF request */
1077         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_ABORT_FCP_CMND,
1078                                      req_flags, adapter->pool.fsf_req_abort,
1079                                      &lock_flags, &fsf_req);
1080         if (retval < 0) {
1081                 ZFCP_LOG_INFO("error: Failed to create an abort command "
1082                               "request for lun 0x%016Lx on port 0x%016Lx "
1083                               "on adapter %s.\n",
1084                               unit->fcp_lun,
1085                               unit->port->wwpn,
1086                               zfcp_get_busid_by_adapter(adapter));
1087                 goto out;
1088         }
1089
1090         if (unlikely(!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
1091                         &unit->status)))
1092                 goto unit_blocked;
1093
1094         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1095         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1096         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1097
1098         fsf_req->data = (unsigned long) unit;
1099
1100         /* set handles of unit and its parent port in QTCB */
1101         fsf_req->qtcb->header.lun_handle = unit->handle;
1102         fsf_req->qtcb->header.port_handle = unit->port->handle;
1103
1104         /* set handle of request which should be aborted */
1105         fsf_req->qtcb->bottom.support.req_handle = (u64) old_req_id;
1106
1107         zfcp_fsf_start_timer(fsf_req, ZFCP_SCSI_ER_TIMEOUT);
1108         retval = zfcp_fsf_req_send(fsf_req);
1109         if (!retval)
1110                 goto out;
1111
1112  unit_blocked:
1113                 zfcp_fsf_req_free(fsf_req);
1114                 fsf_req = NULL;
1115
1116  out:
1117         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
1118         return fsf_req;
1119 }
1120
1121 /*
1122  * function:    zfcp_fsf_abort_fcp_command_handler
1123  *
1124  * purpose:     is called for finished Abort FCP Command request
1125  *
1126  * returns:
1127  */
1128 static int
1129 zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *new_fsf_req)
1130 {
1131         int retval = -EINVAL;
1132         struct zfcp_unit *unit;
1133         union fsf_status_qual *fsf_stat_qual =
1134                 &new_fsf_req->qtcb->header.fsf_status_qual;
1135
1136         if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
1137                 /* do not set ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED */
1138                 goto skip_fsfstatus;
1139         }
1140
1141         unit = (struct zfcp_unit *) new_fsf_req->data;
1142
1143         /* evaluate FSF status in QTCB */
1144         switch (new_fsf_req->qtcb->header.fsf_status) {
1145
1146         case FSF_PORT_HANDLE_NOT_VALID:
1147                 if (fsf_stat_qual->word[0] != fsf_stat_qual->word[1]) {
1148                         /*
1149                          * In this case a command that was sent prior to a port
1150                          * reopen was aborted (handles are different). This is
1151                          * fine.
1152                          */
1153                 } else {
1154                         ZFCP_LOG_INFO("Temporary port identifier 0x%x for "
1155                                       "port 0x%016Lx on adapter %s invalid. "
1156                                       "This may happen occasionally.\n",
1157                                       unit->port->handle,
1158                                       unit->port->wwpn,
1159                                       zfcp_get_busid_by_unit(unit));
1160                         ZFCP_LOG_INFO("status qualifier:\n");
1161                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1162                                       (char *) &new_fsf_req->qtcb->header.
1163                                       fsf_status_qual,
1164                                       sizeof (union fsf_status_qual));
1165                         /* Let's hope this sorts out the mess */
1166                         zfcp_erp_adapter_reopen(unit->port->adapter, 0, 104,
1167                                                 (u64)new_fsf_req);
1168                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1169                 }
1170                 break;
1171
1172         case FSF_LUN_HANDLE_NOT_VALID:
1173                 if (fsf_stat_qual->word[0] != fsf_stat_qual->word[1]) {
1174                         /*
1175                          * In this case a command that was sent prior to a unit
1176                          * reopen was aborted (handles are different).
1177                          * This is fine.
1178                          */
1179                 } else {
1180                         ZFCP_LOG_INFO
1181                             ("Warning: Temporary LUN identifier 0x%x of LUN "
1182                              "0x%016Lx on port 0x%016Lx on adapter %s is "
1183                              "invalid. This may happen in rare cases. "
1184                              "Trying to re-establish link.\n",
1185                              unit->handle,
1186                              unit->fcp_lun,
1187                              unit->port->wwpn,
1188                              zfcp_get_busid_by_unit(unit));
1189                         ZFCP_LOG_DEBUG("Status qualifier data:\n");
1190                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
1191                                       (char *) &new_fsf_req->qtcb->header.
1192                                       fsf_status_qual,
1193                                       sizeof (union fsf_status_qual));
1194                         /* Let's hope this sorts out the mess */
1195                         zfcp_erp_port_reopen(unit->port, 0, 105,
1196                                              (u64)new_fsf_req);
1197                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1198                 }
1199                 break;
1200
1201         case FSF_FCP_COMMAND_DOES_NOT_EXIST:
1202                 retval = 0;
1203                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED;
1204                 break;
1205
1206         case FSF_PORT_BOXED:
1207                 ZFCP_LOG_INFO("Remote port 0x%016Lx on adapter %s needs to "
1208                               "be reopened\n", unit->port->wwpn,
1209                               zfcp_get_busid_by_unit(unit));
1210                 zfcp_erp_port_boxed(unit->port, 47, (u64)new_fsf_req);
1211                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
1212                     | ZFCP_STATUS_FSFREQ_RETRY;
1213                 break;
1214
1215         case FSF_LUN_BOXED:
1216                 ZFCP_LOG_INFO(
1217                         "unit 0x%016Lx on port 0x%016Lx on adapter %s needs "
1218                         "to be reopened\n",
1219                         unit->fcp_lun, unit->port->wwpn,
1220                         zfcp_get_busid_by_unit(unit));
1221                 zfcp_erp_unit_boxed(unit, 48, (u64)new_fsf_req);
1222                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
1223                         | ZFCP_STATUS_FSFREQ_RETRY;
1224                 break;
1225
1226         case FSF_ADAPTER_STATUS_AVAILABLE:
1227                 switch (new_fsf_req->qtcb->header.fsf_status_qual.word[0]) {
1228                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1229                         zfcp_test_link(unit->port);
1230                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1231                         break;
1232                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1233                         /* SCSI stack will escalate */
1234                         new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1235                         break;
1236                 default:
1237                         ZFCP_LOG_NORMAL
1238                             ("bug: Wrong status qualifier 0x%x arrived.\n",
1239                              new_fsf_req->qtcb->header.fsf_status_qual.word[0]);
1240                         break;
1241                 }
1242                 break;
1243
1244         case FSF_GOOD:
1245                 retval = 0;
1246                 new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED;
1247                 break;
1248
1249         default:
1250                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
1251                                 "(debug info 0x%x)\n",
1252                                 new_fsf_req->qtcb->header.fsf_status);
1253                 break;
1254         }
1255  skip_fsfstatus:
1256         return retval;
1257 }
1258
1259 /**
1260  * zfcp_use_one_sbal - checks whether req buffer and resp bother each fit into
1261  *      one SBALE
1262  * Two scatter-gather lists are passed, one for the reqeust and one for the
1263  * response.
1264  */
1265 static inline int
1266 zfcp_use_one_sbal(struct scatterlist *req, int req_count,
1267                   struct scatterlist *resp, int resp_count)
1268 {
1269         return ((req_count == 1) &&
1270                 (resp_count == 1) &&
1271                 (((unsigned long) zfcp_sg_to_address(&req[0]) &
1272                   PAGE_MASK) ==
1273                  ((unsigned long) (zfcp_sg_to_address(&req[0]) +
1274                                    req[0].length - 1) & PAGE_MASK)) &&
1275                 (((unsigned long) zfcp_sg_to_address(&resp[0]) &
1276                   PAGE_MASK) ==
1277                  ((unsigned long) (zfcp_sg_to_address(&resp[0]) +
1278                                    resp[0].length - 1) & PAGE_MASK)));
1279 }
1280
1281 /**
1282  * zfcp_fsf_send_ct - initiate a Generic Service request (FC-GS)
1283  * @ct: pointer to struct zfcp_send_ct which conatins all needed data for
1284  *      the request
1285  * @pool: pointer to memory pool, if non-null this pool is used to allocate
1286  *      a struct zfcp_fsf_req
1287  * @erp_action: pointer to erp_action, if non-null the Generic Service request
1288  *      is sent within error recovery
1289  */
1290 int
1291 zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
1292                  struct zfcp_erp_action *erp_action)
1293 {
1294         volatile struct qdio_buffer_element *sbale;
1295         struct zfcp_port *port;
1296         struct zfcp_adapter *adapter;
1297         struct zfcp_fsf_req *fsf_req;
1298         unsigned long lock_flags;
1299         int bytes;
1300         int ret = 0;
1301
1302         port = ct->port;
1303         adapter = port->adapter;
1304
1305         ret = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_GENERIC,
1306                                   ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
1307                                   pool, &lock_flags, &fsf_req);
1308         if (ret < 0) {
1309                 ZFCP_LOG_INFO("error: Could not create CT request (FC-GS) for "
1310                               "adapter: %s\n",
1311                               zfcp_get_busid_by_adapter(adapter));
1312                 goto failed_req;
1313         }
1314
1315         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1316         if (zfcp_use_one_sbal(ct->req, ct->req_count,
1317                               ct->resp, ct->resp_count)){
1318                 /* both request buffer and response buffer
1319                    fit into one sbale each */
1320                 sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
1321                 sbale[2].addr = zfcp_sg_to_address(&ct->req[0]);
1322                 sbale[2].length = ct->req[0].length;
1323                 sbale[3].addr = zfcp_sg_to_address(&ct->resp[0]);
1324                 sbale[3].length = ct->resp[0].length;
1325                 sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
1326         } else if (adapter->adapter_features &
1327                    FSF_FEATURE_ELS_CT_CHAINED_SBALS) {
1328                 /* try to use chained SBALs */
1329                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1330                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1331                                                 ct->req, ct->req_count,
1332                                                 ZFCP_MAX_SBALS_PER_CT_REQ);
1333                 if (bytes <= 0) {
1334                         ZFCP_LOG_INFO("error: creation of CT request failed "
1335                                       "on adapter %s\n",
1336                                       zfcp_get_busid_by_adapter(adapter));
1337                         if (bytes == 0)
1338                                 ret = -ENOMEM;
1339                         else
1340                                 ret = bytes;
1341
1342                         goto failed_send;
1343                 }
1344                 fsf_req->qtcb->bottom.support.req_buf_length = bytes;
1345                 fsf_req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
1346                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1347                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1348                                                 ct->resp, ct->resp_count,
1349                                                 ZFCP_MAX_SBALS_PER_CT_REQ);
1350                 if (bytes <= 0) {
1351                         ZFCP_LOG_INFO("error: creation of CT request failed "
1352                                       "on adapter %s\n",
1353                                       zfcp_get_busid_by_adapter(adapter));
1354                         if (bytes == 0)
1355                                 ret = -ENOMEM;
1356                         else
1357                                 ret = bytes;
1358
1359                         goto failed_send;
1360                 }
1361                 fsf_req->qtcb->bottom.support.resp_buf_length = bytes;
1362         } else {
1363                 /* reject send generic request */
1364                 ZFCP_LOG_INFO(
1365                         "error: microcode does not support chained SBALs,"
1366                         "CT request too big (adapter %s)\n",
1367                         zfcp_get_busid_by_adapter(adapter));
1368                 ret = -EOPNOTSUPP;
1369                 goto failed_send;
1370         }
1371
1372         /* settings in QTCB */
1373         fsf_req->qtcb->header.port_handle = port->handle;
1374         fsf_req->qtcb->bottom.support.service_class =
1375                 ZFCP_FC_SERVICE_CLASS_DEFAULT;
1376         fsf_req->qtcb->bottom.support.timeout = ct->timeout;
1377         fsf_req->data = (unsigned long) ct;
1378
1379         zfcp_san_dbf_event_ct_request(fsf_req);
1380
1381         if (erp_action) {
1382                 erp_action->fsf_req = fsf_req;
1383                 fsf_req->erp_action = erp_action;
1384                 zfcp_erp_start_timer(fsf_req);
1385         } else
1386                 zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
1387
1388         ret = zfcp_fsf_req_send(fsf_req);
1389         if (ret) {
1390                 ZFCP_LOG_DEBUG("error: initiation of CT request failed "
1391                                "(adapter %s, port 0x%016Lx)\n",
1392                                zfcp_get_busid_by_adapter(adapter), port->wwpn);
1393                 goto failed_send;
1394         }
1395
1396         ZFCP_LOG_DEBUG("CT request initiated (adapter %s, port 0x%016Lx)\n",
1397                        zfcp_get_busid_by_adapter(adapter), port->wwpn);
1398         goto out;
1399
1400  failed_send:
1401         zfcp_fsf_req_free(fsf_req);
1402         if (erp_action != NULL) {
1403                 erp_action->fsf_req = NULL;
1404         }
1405  failed_req:
1406  out:
1407         write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1408                                 lock_flags);
1409         return ret;
1410 }
1411
1412 /**
1413  * zfcp_fsf_send_ct_handler - handler for Generic Service requests
1414  * @fsf_req: pointer to struct zfcp_fsf_req
1415  *
1416  * Data specific for the Generic Service request is passed using
1417  * fsf_req->data. There we find the pointer to struct zfcp_send_ct.
1418  * Usually a specific handler for the CT request is called which is
1419  * found in this structure.
1420  */
1421 static int
1422 zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *fsf_req)
1423 {
1424         struct zfcp_port *port;
1425         struct zfcp_adapter *adapter;
1426         struct zfcp_send_ct *send_ct;
1427         struct fsf_qtcb_header *header;
1428         struct fsf_qtcb_bottom_support *bottom;
1429         int retval = -EINVAL;
1430         u16 subtable, rule, counter;
1431
1432         adapter = fsf_req->adapter;
1433         send_ct = (struct zfcp_send_ct *) fsf_req->data;
1434         port = send_ct->port;
1435         header = &fsf_req->qtcb->header;
1436         bottom = &fsf_req->qtcb->bottom.support;
1437
1438         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
1439                 goto skip_fsfstatus;
1440
1441         /* evaluate FSF status in QTCB */
1442         switch (header->fsf_status) {
1443
1444         case FSF_GOOD:
1445                 zfcp_san_dbf_event_ct_response(fsf_req);
1446                 retval = 0;
1447                 break;
1448
1449         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
1450                 ZFCP_LOG_INFO("error: adapter %s does not support fc "
1451                               "class %d.\n",
1452                               zfcp_get_busid_by_port(port),
1453                               ZFCP_FC_SERVICE_CLASS_DEFAULT);
1454                 /* stop operation for this adapter */
1455                 zfcp_erp_adapter_shutdown(adapter, 0, 123, (u64)fsf_req);
1456                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1457                 break;
1458
1459         case FSF_ADAPTER_STATUS_AVAILABLE:
1460                 switch (header->fsf_status_qual.word[0]){
1461                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1462                         /* reopening link to port */
1463                         zfcp_test_link(port);
1464                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1465                         break;
1466                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1467                         /* ERP strategy will escalate */
1468                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1469                         break;
1470                 default:
1471                         ZFCP_LOG_INFO("bug: Wrong status qualifier 0x%x "
1472                                       "arrived.\n",
1473                                       header->fsf_status_qual.word[0]);
1474                         break;
1475                 }
1476                 break;
1477
1478         case FSF_ACCESS_DENIED:
1479                 ZFCP_LOG_NORMAL("access denied, cannot send generic service "
1480                                 "command (adapter %s, port d_id=0x%06x)\n",
1481                                 zfcp_get_busid_by_port(port), port->d_id);
1482                 for (counter = 0; counter < 2; counter++) {
1483                         subtable = header->fsf_status_qual.halfword[counter * 2];
1484                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
1485                         switch (subtable) {
1486                         case FSF_SQ_CFDC_SUBTABLE_OS:
1487                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
1488                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
1489                         case FSF_SQ_CFDC_SUBTABLE_LUN:
1490                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
1491                                         zfcp_act_subtable_type[subtable], rule);
1492                                 break;
1493                         }
1494                 }
1495                 zfcp_erp_port_access_denied(port, 55, (u64)fsf_req);
1496                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1497                 break;
1498
1499         case FSF_GENERIC_COMMAND_REJECTED:
1500                 ZFCP_LOG_INFO("generic service command rejected "
1501                               "(adapter %s, port d_id=0x%06x)\n",
1502                               zfcp_get_busid_by_port(port), port->d_id);
1503                 ZFCP_LOG_INFO("status qualifier:\n");
1504                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1505                               (char *) &header->fsf_status_qual,
1506                               sizeof (union fsf_status_qual));
1507                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1508                 break;
1509
1510         case FSF_PORT_HANDLE_NOT_VALID:
1511                 ZFCP_LOG_DEBUG("Temporary port identifier 0x%x for port "
1512                                "0x%016Lx on adapter %s invalid. This may "
1513                                "happen occasionally.\n", port->handle,
1514                                port->wwpn, zfcp_get_busid_by_port(port));
1515                 ZFCP_LOG_INFO("status qualifier:\n");
1516                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1517                               (char *) &header->fsf_status_qual,
1518                               sizeof (union fsf_status_qual));
1519                 zfcp_erp_adapter_reopen(adapter, 0, 106, (u64)fsf_req);
1520                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1521                 break;
1522
1523         case FSF_PORT_BOXED:
1524                 ZFCP_LOG_INFO("port needs to be reopened "
1525                               "(adapter %s, port d_id=0x%06x)\n",
1526                               zfcp_get_busid_by_port(port), port->d_id);
1527                 zfcp_erp_port_boxed(port, 49, (u64)fsf_req);
1528                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
1529                     | ZFCP_STATUS_FSFREQ_RETRY;
1530                 break;
1531
1532         /* following states should never occure, all cases avoided
1533            in zfcp_fsf_send_ct - but who knows ... */
1534         case FSF_PAYLOAD_SIZE_MISMATCH:
1535                 ZFCP_LOG_INFO("payload size mismatch (adapter: %s, "
1536                               "req_buf_length=%d, resp_buf_length=%d)\n",
1537                               zfcp_get_busid_by_adapter(adapter),
1538                               bottom->req_buf_length, bottom->resp_buf_length);
1539                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1540                 break;
1541         case FSF_REQUEST_SIZE_TOO_LARGE:
1542                 ZFCP_LOG_INFO("request size too large (adapter: %s, "
1543                               "req_buf_length=%d)\n",
1544                               zfcp_get_busid_by_adapter(adapter),
1545                               bottom->req_buf_length);
1546                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1547                 break;
1548         case FSF_RESPONSE_SIZE_TOO_LARGE:
1549                 ZFCP_LOG_INFO("response size too large (adapter: %s, "
1550                               "resp_buf_length=%d)\n",
1551                               zfcp_get_busid_by_adapter(adapter),
1552                               bottom->resp_buf_length);
1553                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1554                 break;
1555         case FSF_SBAL_MISMATCH:
1556                 ZFCP_LOG_INFO("SBAL mismatch (adapter: %s, req_buf_length=%d, "
1557                               "resp_buf_length=%d)\n",
1558                               zfcp_get_busid_by_adapter(adapter),
1559                               bottom->req_buf_length, bottom->resp_buf_length);
1560                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1561                 break;
1562
1563        default:
1564                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
1565                                 "(debug info 0x%x)\n", header->fsf_status);
1566                 break;
1567         }
1568
1569 skip_fsfstatus:
1570         send_ct->status = retval;
1571
1572         if (send_ct->handler != NULL)
1573                 send_ct->handler(send_ct->handler_data);
1574
1575         return retval;
1576 }
1577
1578 /**
1579  * zfcp_fsf_send_els - initiate an ELS command (FC-FS)
1580  * @els: pointer to struct zfcp_send_els which contains all needed data for
1581  *      the command.
1582  */
1583 int
1584 zfcp_fsf_send_els(struct zfcp_send_els *els)
1585 {
1586         volatile struct qdio_buffer_element *sbale;
1587         struct zfcp_fsf_req *fsf_req;
1588         u32 d_id;
1589         struct zfcp_adapter *adapter;
1590         unsigned long lock_flags;
1591         int bytes;
1592         int ret = 0;
1593
1594         d_id = els->d_id;
1595         adapter = els->adapter;
1596
1597         ret = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_ELS,
1598                                   ZFCP_REQ_AUTO_CLEANUP,
1599                                   NULL, &lock_flags, &fsf_req);
1600         if (ret < 0) {
1601                 ZFCP_LOG_INFO("error: creation of ELS request failed "
1602                               "(adapter %s, port d_id: 0x%06x)\n",
1603                               zfcp_get_busid_by_adapter(adapter), d_id);
1604                 goto failed_req;
1605         }
1606
1607         if (unlikely(!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
1608                         &els->port->status))) {
1609                 ret = -EBUSY;
1610                 goto port_blocked;
1611         }
1612
1613         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1614         if (zfcp_use_one_sbal(els->req, els->req_count,
1615                               els->resp, els->resp_count)){
1616                 /* both request buffer and response buffer
1617                    fit into one sbale each */
1618                 sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
1619                 sbale[2].addr = zfcp_sg_to_address(&els->req[0]);
1620                 sbale[2].length = els->req[0].length;
1621                 sbale[3].addr = zfcp_sg_to_address(&els->resp[0]);
1622                 sbale[3].length = els->resp[0].length;
1623                 sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
1624         } else if (adapter->adapter_features &
1625                    FSF_FEATURE_ELS_CT_CHAINED_SBALS) {
1626                 /* try to use chained SBALs */
1627                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1628                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1629                                                 els->req, els->req_count,
1630                                                 ZFCP_MAX_SBALS_PER_ELS_REQ);
1631                 if (bytes <= 0) {
1632                         ZFCP_LOG_INFO("error: creation of ELS request failed "
1633                                       "(adapter %s, port d_id: 0x%06x)\n",
1634                                       zfcp_get_busid_by_adapter(adapter), d_id);
1635                         if (bytes == 0) {
1636                                 ret = -ENOMEM;
1637                         } else {
1638                                 ret = bytes;
1639                         }
1640                         goto failed_send;
1641                 }
1642                 fsf_req->qtcb->bottom.support.req_buf_length = bytes;
1643                 fsf_req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
1644                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
1645                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
1646                                                 els->resp, els->resp_count,
1647                                                 ZFCP_MAX_SBALS_PER_ELS_REQ);
1648                 if (bytes <= 0) {
1649                         ZFCP_LOG_INFO("error: creation of ELS request failed "
1650                                       "(adapter %s, port d_id: 0x%06x)\n",
1651                                       zfcp_get_busid_by_adapter(adapter), d_id);
1652                         if (bytes == 0) {
1653                                 ret = -ENOMEM;
1654                         } else {
1655                                 ret = bytes;
1656                         }
1657                         goto failed_send;
1658                 }
1659                 fsf_req->qtcb->bottom.support.resp_buf_length = bytes;
1660         } else {
1661                 /* reject request */
1662                 ZFCP_LOG_INFO("error: microcode does not support chained SBALs"
1663                               ", ELS request too big (adapter %s, "
1664                               "port d_id: 0x%06x)\n",
1665                               zfcp_get_busid_by_adapter(adapter), d_id);
1666                 ret = -EOPNOTSUPP;
1667                 goto failed_send;
1668         }
1669
1670         /* settings in QTCB */
1671         fsf_req->qtcb->bottom.support.d_id = d_id;
1672         fsf_req->qtcb->bottom.support.service_class =
1673                 ZFCP_FC_SERVICE_CLASS_DEFAULT;
1674         fsf_req->qtcb->bottom.support.timeout = ZFCP_ELS_TIMEOUT;
1675         fsf_req->data = (unsigned long) els;
1676
1677         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1678
1679         zfcp_san_dbf_event_els_request(fsf_req);
1680
1681         zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
1682         ret = zfcp_fsf_req_send(fsf_req);
1683         if (ret) {
1684                 ZFCP_LOG_DEBUG("error: initiation of ELS request failed "
1685                                "(adapter %s, port d_id: 0x%06x)\n",
1686                                zfcp_get_busid_by_adapter(adapter), d_id);
1687                 goto failed_send;
1688         }
1689
1690         ZFCP_LOG_DEBUG("ELS request initiated (adapter %s, port d_id: "
1691                        "0x%06x)\n", zfcp_get_busid_by_adapter(adapter), d_id);
1692         goto out;
1693
1694  port_blocked:
1695  failed_send:
1696         zfcp_fsf_req_free(fsf_req);
1697
1698  failed_req:
1699  out:
1700         write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1701                                 lock_flags);
1702
1703         return ret;
1704 }
1705
1706 /**
1707  * zfcp_fsf_send_els_handler - handler for ELS commands
1708  * @fsf_req: pointer to struct zfcp_fsf_req
1709  *
1710  * Data specific for the ELS command is passed using
1711  * fsf_req->data. There we find the pointer to struct zfcp_send_els.
1712  * Usually a specific handler for the ELS command is called which is
1713  * found in this structure.
1714  */
1715 static int zfcp_fsf_send_els_handler(struct zfcp_fsf_req *fsf_req)
1716 {
1717         struct zfcp_adapter *adapter;
1718         struct zfcp_port *port;
1719         u32 d_id;
1720         struct fsf_qtcb_header *header;
1721         struct fsf_qtcb_bottom_support *bottom;
1722         struct zfcp_send_els *send_els;
1723         int retval = -EINVAL;
1724         u16 subtable, rule, counter;
1725
1726         send_els = (struct zfcp_send_els *) fsf_req->data;
1727         adapter = send_els->adapter;
1728         port = send_els->port;
1729         d_id = send_els->d_id;
1730         header = &fsf_req->qtcb->header;
1731         bottom = &fsf_req->qtcb->bottom.support;
1732
1733         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
1734                 goto skip_fsfstatus;
1735
1736         switch (header->fsf_status) {
1737
1738         case FSF_GOOD:
1739                 zfcp_san_dbf_event_els_response(fsf_req);
1740                 retval = 0;
1741                 break;
1742
1743         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
1744                 ZFCP_LOG_INFO("error: adapter %s does not support fc "
1745                               "class %d.\n",
1746                               zfcp_get_busid_by_adapter(adapter),
1747                               ZFCP_FC_SERVICE_CLASS_DEFAULT);
1748                 /* stop operation for this adapter */
1749                 zfcp_erp_adapter_shutdown(adapter, 0, 124, (u64)fsf_req);
1750                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1751                 break;
1752
1753         case FSF_ADAPTER_STATUS_AVAILABLE:
1754                 switch (header->fsf_status_qual.word[0]){
1755                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1756                         if (port && (send_els->ls_code != ZFCP_LS_ADISC))
1757                                 zfcp_test_link(port);
1758                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1759                         break;
1760                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1761                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1762                         retval =
1763                           zfcp_handle_els_rjt(header->fsf_status_qual.word[1],
1764                                               (struct zfcp_ls_rjt_par *)
1765                                               &header->fsf_status_qual.word[2]);
1766                         break;
1767                 case FSF_SQ_RETRY_IF_POSSIBLE:
1768                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1769                         break;
1770                 default:
1771                         ZFCP_LOG_INFO("bug: Wrong status qualifier 0x%x\n",
1772                                       header->fsf_status_qual.word[0]);
1773                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
1774                                 (char*)header->fsf_status_qual.word, 16);
1775                 }
1776                 break;
1777
1778         case FSF_ELS_COMMAND_REJECTED:
1779                 ZFCP_LOG_INFO("ELS has been rejected because command filter "
1780                               "prohibited sending "
1781                               "(adapter: %s, port d_id: 0x%06x)\n",
1782                               zfcp_get_busid_by_adapter(adapter), d_id);
1783
1784                 break;
1785
1786         case FSF_PAYLOAD_SIZE_MISMATCH:
1787                 ZFCP_LOG_INFO(
1788                         "ELS request size and ELS response size must be either "
1789                         "both 0, or both greater than 0 "
1790                         "(adapter: %s, req_buf_length=%d resp_buf_length=%d)\n",
1791                         zfcp_get_busid_by_adapter(adapter),
1792                         bottom->req_buf_length,
1793                         bottom->resp_buf_length);
1794                 break;
1795
1796         case FSF_REQUEST_SIZE_TOO_LARGE:
1797                 ZFCP_LOG_INFO(
1798                         "Length of the ELS request buffer, "
1799                         "specified in QTCB bottom, "
1800                         "exceeds the size of the buffers "
1801                         "that have been allocated for ELS request data "
1802                         "(adapter: %s, req_buf_length=%d)\n",
1803                         zfcp_get_busid_by_adapter(adapter),
1804                         bottom->req_buf_length);
1805                 break;
1806
1807         case FSF_RESPONSE_SIZE_TOO_LARGE:
1808                 ZFCP_LOG_INFO(
1809                         "Length of the ELS response buffer, "
1810                         "specified in QTCB bottom, "
1811                         "exceeds the size of the buffers "
1812                         "that have been allocated for ELS response data "
1813                         "(adapter: %s, resp_buf_length=%d)\n",
1814                         zfcp_get_busid_by_adapter(adapter),
1815                         bottom->resp_buf_length);
1816                 break;
1817
1818         case FSF_SBAL_MISMATCH:
1819                 /* should never occure, avoided in zfcp_fsf_send_els */
1820                 ZFCP_LOG_INFO("SBAL mismatch (adapter: %s, req_buf_length=%d, "
1821                               "resp_buf_length=%d)\n",
1822                               zfcp_get_busid_by_adapter(adapter),
1823                               bottom->req_buf_length, bottom->resp_buf_length);
1824                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1825                 break;
1826
1827         case FSF_ACCESS_DENIED:
1828                 ZFCP_LOG_NORMAL("access denied, cannot send ELS command "
1829                                 "(adapter %s, port d_id=0x%06x)\n",
1830                                 zfcp_get_busid_by_adapter(adapter), d_id);
1831                 for (counter = 0; counter < 2; counter++) {
1832                         subtable = header->fsf_status_qual.halfword[counter * 2];
1833                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
1834                         switch (subtable) {
1835                         case FSF_SQ_CFDC_SUBTABLE_OS:
1836                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
1837                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
1838                         case FSF_SQ_CFDC_SUBTABLE_LUN:
1839                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
1840                                         zfcp_act_subtable_type[subtable], rule);
1841                                 break;
1842                         }
1843                 }
1844                 if (port != NULL)
1845                         zfcp_erp_port_access_denied(port, 56, (u64)fsf_req);
1846                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1847                 break;
1848
1849         default:
1850                 ZFCP_LOG_NORMAL(
1851                         "bug: An unknown FSF Status was presented "
1852                         "(adapter: %s, fsf_status=0x%08x)\n",
1853                         zfcp_get_busid_by_adapter(adapter),
1854                         header->fsf_status);
1855                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1856                 break;
1857         }
1858
1859 skip_fsfstatus:
1860         send_els->status = retval;
1861
1862         if (send_els->handler)
1863                 send_els->handler(send_els->handler_data);
1864
1865         return retval;
1866 }
1867
1868 int
1869 zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
1870 {
1871         volatile struct qdio_buffer_element *sbale;
1872         struct zfcp_fsf_req *fsf_req;
1873         struct zfcp_adapter *adapter = erp_action->adapter;
1874         unsigned long lock_flags;
1875         int retval;
1876
1877         /* setup new FSF request */
1878         retval = zfcp_fsf_req_create(adapter,
1879                                      FSF_QTCB_EXCHANGE_CONFIG_DATA,
1880                                      ZFCP_REQ_AUTO_CLEANUP,
1881                                      adapter->pool.fsf_req_erp,
1882                                      &lock_flags, &fsf_req);
1883         if (retval) {
1884                 ZFCP_LOG_INFO("error: Could not create exchange configuration "
1885                               "data request for adapter %s.\n",
1886                               zfcp_get_busid_by_adapter(adapter));
1887                 write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1888                                         lock_flags);
1889                 return retval;
1890         }
1891
1892         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1893         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1894         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1895
1896         fsf_req->qtcb->bottom.config.feature_selection =
1897                         FSF_FEATURE_CFDC |
1898                         FSF_FEATURE_LUN_SHARING |
1899                         FSF_FEATURE_NOTIFICATION_LOST |
1900                         FSF_FEATURE_UPDATE_ALERT;
1901         fsf_req->erp_action = erp_action;
1902         erp_action->fsf_req = fsf_req;
1903
1904         zfcp_erp_start_timer(fsf_req);
1905         retval = zfcp_fsf_req_send(fsf_req);
1906         write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1907                                 lock_flags);
1908         if (retval) {
1909                 ZFCP_LOG_INFO("error: Could not send exchange configuration "
1910                               "data command on the adapter %s\n",
1911                               zfcp_get_busid_by_adapter(adapter));
1912                 zfcp_fsf_req_free(fsf_req);
1913                 erp_action->fsf_req = NULL;
1914         }
1915         else
1916                 ZFCP_LOG_DEBUG("exchange configuration data request initiated "
1917                                "(adapter %s)\n",
1918                                zfcp_get_busid_by_adapter(adapter));
1919
1920         return retval;
1921 }
1922
1923 int
1924 zfcp_fsf_exchange_config_data_sync(struct zfcp_adapter *adapter,
1925                                 struct fsf_qtcb_bottom_config *data)
1926 {
1927         volatile struct qdio_buffer_element *sbale;
1928         struct zfcp_fsf_req *fsf_req;
1929         unsigned long lock_flags;
1930         int retval;
1931
1932         /* setup new FSF request */
1933         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_CONFIG_DATA,
1934                                      0, NULL, &lock_flags, &fsf_req);
1935         if (retval) {
1936                 ZFCP_LOG_INFO("error: Could not create exchange configuration "
1937                               "data request for adapter %s.\n",
1938                               zfcp_get_busid_by_adapter(adapter));
1939                 write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1940                                         lock_flags);
1941                 return retval;
1942         }
1943
1944         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
1945         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
1946         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
1947
1948         fsf_req->qtcb->bottom.config.feature_selection =
1949                         FSF_FEATURE_CFDC |
1950                         FSF_FEATURE_LUN_SHARING |
1951                         FSF_FEATURE_NOTIFICATION_LOST |
1952                         FSF_FEATURE_UPDATE_ALERT;
1953
1954         if (data)
1955                 fsf_req->data = (unsigned long) data;
1956
1957         zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
1958         retval = zfcp_fsf_req_send(fsf_req);
1959         write_unlock_irqrestore(&adapter->request_queue.queue_lock,
1960                                 lock_flags);
1961         if (retval)
1962                 ZFCP_LOG_INFO("error: Could not send exchange configuration "
1963                               "data command on the adapter %s\n",
1964                               zfcp_get_busid_by_adapter(adapter));
1965         else
1966                 wait_event(fsf_req->completion_wq,
1967                            fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
1968
1969         zfcp_fsf_req_free(fsf_req);
1970
1971         return retval;
1972 }
1973
1974 /**
1975  * zfcp_fsf_exchange_config_evaluate
1976  * @fsf_req: fsf_req which belongs to xchg config data request
1977  * @xchg_ok: specifies if xchg config data was incomplete or complete (0/1)
1978  *
1979  * returns: -EIO on error, 0 otherwise
1980  */
1981 static int
1982 zfcp_fsf_exchange_config_evaluate(struct zfcp_fsf_req *fsf_req, int xchg_ok)
1983 {
1984         struct fsf_qtcb_bottom_config *bottom;
1985         struct zfcp_adapter *adapter = fsf_req->adapter;
1986         struct Scsi_Host *shost = adapter->scsi_host;
1987
1988         bottom = &fsf_req->qtcb->bottom.config;
1989         ZFCP_LOG_DEBUG("low/high QTCB version 0x%x/0x%x of FSF\n",
1990                        bottom->low_qtcb_version, bottom->high_qtcb_version);
1991         adapter->fsf_lic_version = bottom->lic_version;
1992         adapter->adapter_features = bottom->adapter_features;
1993         adapter->connection_features = bottom->connection_features;
1994         adapter->peer_wwpn = 0;
1995         adapter->peer_wwnn = 0;
1996         adapter->peer_d_id = 0;
1997
1998         if (xchg_ok) {
1999
2000                 if (fsf_req->data)
2001                         memcpy((struct fsf_qtcb_bottom_config *) fsf_req->data,
2002                                 bottom, sizeof (struct fsf_qtcb_bottom_config));
2003
2004                 fc_host_node_name(shost) = bottom->nport_serv_param.wwnn;
2005                 fc_host_port_name(shost) = bottom->nport_serv_param.wwpn;
2006                 fc_host_port_id(shost) = bottom->s_id & ZFCP_DID_MASK;
2007                 fc_host_speed(shost) = bottom->fc_link_speed;
2008                 fc_host_supported_classes(shost) =
2009                                 FC_COS_CLASS2 | FC_COS_CLASS3;
2010                 adapter->hydra_version = bottom->adapter_type;
2011                 if (fc_host_permanent_port_name(shost) == -1)
2012                         fc_host_permanent_port_name(shost) =
2013                                 fc_host_port_name(shost);
2014                 if (bottom->fc_topology == FSF_TOPO_P2P) {
2015                         adapter->peer_d_id = bottom->peer_d_id & ZFCP_DID_MASK;
2016                         adapter->peer_wwpn = bottom->plogi_payload.wwpn;
2017                         adapter->peer_wwnn = bottom->plogi_payload.wwnn;
2018                         fc_host_port_type(shost) = FC_PORTTYPE_PTP;
2019                 } else if (bottom->fc_topology == FSF_TOPO_FABRIC)
2020                         fc_host_port_type(shost) = FC_PORTTYPE_NPORT;
2021                 else if (bottom->fc_topology == FSF_TOPO_AL)
2022                         fc_host_port_type(shost) = FC_PORTTYPE_NLPORT;
2023                 else
2024                         fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
2025         } else {
2026                 fc_host_node_name(shost) = 0;
2027                 fc_host_port_name(shost) = 0;
2028                 fc_host_port_id(shost) = 0;
2029                 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
2030                 fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
2031                 adapter->hydra_version = 0;
2032         }
2033
2034         if (adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT) {
2035                 adapter->hardware_version = bottom->hardware_version;
2036                 memcpy(fc_host_serial_number(shost), bottom->serial_number,
2037                        min(FC_SERIAL_NUMBER_SIZE, 17));
2038                 EBCASC(fc_host_serial_number(shost),
2039                        min(FC_SERIAL_NUMBER_SIZE, 17));
2040         }
2041
2042         ZFCP_LOG_NORMAL("The adapter %s reported the following "
2043                         "characteristics:\n"
2044                         "WWNN 0x%016Lx, "
2045                         "WWPN 0x%016Lx, "
2046                         "S_ID 0x%06x,\n"
2047                         "adapter version 0x%x, "
2048                         "LIC version 0x%x, "
2049                         "FC link speed %d Gb/s\n",
2050                         zfcp_get_busid_by_adapter(adapter),
2051                         (wwn_t) fc_host_node_name(shost),
2052                         (wwn_t) fc_host_port_name(shost),
2053                         fc_host_port_id(shost),
2054                         adapter->hydra_version,
2055                         adapter->fsf_lic_version,
2056                         fc_host_speed(shost));
2057         if (ZFCP_QTCB_VERSION < bottom->low_qtcb_version) {
2058                 ZFCP_LOG_NORMAL("error: the adapter %s "
2059                                 "only supports newer control block "
2060                                 "versions in comparison to this device "
2061                                 "driver (try updated device driver)\n",
2062                                 zfcp_get_busid_by_adapter(adapter));
2063                 zfcp_erp_adapter_shutdown(adapter, 0, 125, (u64)fsf_req);
2064                 return -EIO;
2065         }
2066         if (ZFCP_QTCB_VERSION > bottom->high_qtcb_version) {
2067                 ZFCP_LOG_NORMAL("error: the adapter %s "
2068                                 "only supports older control block "
2069                                 "versions than this device driver uses"
2070                                 "(consider a microcode upgrade)\n",
2071                                 zfcp_get_busid_by_adapter(adapter));
2072                 zfcp_erp_adapter_shutdown(adapter, 0, 126, (u64)fsf_req);
2073                 return -EIO;
2074         }
2075         return 0;
2076 }
2077
2078 /**
2079  * function:    zfcp_fsf_exchange_config_data_handler
2080  *
2081  * purpose:     is called for finished Exchange Configuration Data command
2082  *
2083  * returns:
2084  */
2085 static int
2086 zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *fsf_req)
2087 {
2088         struct fsf_qtcb_bottom_config *bottom;
2089         struct zfcp_adapter *adapter = fsf_req->adapter;
2090         struct fsf_qtcb *qtcb = fsf_req->qtcb;
2091
2092         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
2093                 return -EIO;
2094
2095         switch (qtcb->header.fsf_status) {
2096
2097         case FSF_GOOD:
2098                 if (zfcp_fsf_exchange_config_evaluate(fsf_req, 1))
2099                         return -EIO;
2100
2101                 switch (fc_host_port_type(adapter->scsi_host)) {
2102                 case FC_PORTTYPE_PTP:
2103                         ZFCP_LOG_NORMAL("Point-to-Point fibrechannel "
2104                                         "configuration detected at adapter %s\n"
2105                                         "Peer WWNN 0x%016llx, "
2106                                         "peer WWPN 0x%016llx, "
2107                                         "peer d_id 0x%06x\n",
2108                                         zfcp_get_busid_by_adapter(adapter),
2109                                         adapter->peer_wwnn,
2110                                         adapter->peer_wwpn,
2111                                         adapter->peer_d_id);
2112                         break;
2113                 case FC_PORTTYPE_NLPORT:
2114                         ZFCP_LOG_NORMAL("error: Arbitrated loop fibrechannel "
2115                                         "topology detected at adapter %s "
2116                                         "unsupported, shutting down adapter\n",
2117                                         zfcp_get_busid_by_adapter(adapter));
2118                         zfcp_erp_adapter_shutdown(adapter, 0, 127, (u64)fsf_req);
2119                         return -EIO;
2120                 case FC_PORTTYPE_NPORT:
2121                         ZFCP_LOG_NORMAL("Switched fabric fibrechannel "
2122                                         "network detected at adapter %s.\n",
2123                                         zfcp_get_busid_by_adapter(adapter));
2124                         break;
2125                 default:
2126                         ZFCP_LOG_NORMAL("bug: The fibrechannel topology "
2127                                         "reported by the exchange "
2128                                         "configuration command for "
2129                                         "the adapter %s is not "
2130                                         "of a type known to the zfcp "
2131                                         "driver, shutting down adapter\n",
2132                                         zfcp_get_busid_by_adapter(adapter));
2133                         zfcp_erp_adapter_shutdown(adapter, 0, 128, (u64)fsf_req);
2134                         return -EIO;
2135                 }
2136                 bottom = &qtcb->bottom.config;
2137                 if (bottom->max_qtcb_size < sizeof(struct fsf_qtcb)) {
2138                         ZFCP_LOG_NORMAL("bug: Maximum QTCB size (%d bytes) "
2139                                         "allowed by the adapter %s "
2140                                         "is lower than the minimum "
2141                                         "required by the driver (%ld bytes).\n",
2142                                         bottom->max_qtcb_size,
2143                                         zfcp_get_busid_by_adapter(adapter),
2144                                         sizeof(struct fsf_qtcb));
2145                         zfcp_erp_adapter_shutdown(adapter, 0, 129, (u64)fsf_req);
2146                         return -EIO;
2147                 }
2148                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
2149                                 &adapter->status);
2150                 break;
2151         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
2152                 if (zfcp_fsf_exchange_config_evaluate(fsf_req, 0))
2153                         return -EIO;
2154
2155                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
2156                                 &adapter->status);
2157
2158                 zfcp_fsf_link_down_info_eval(fsf_req, 42,
2159                         &qtcb->header.fsf_status_qual.link_down_info);
2160                 break;
2161         default:
2162                 zfcp_erp_adapter_shutdown(adapter, 0, 130, (u64)fsf_req);
2163                 return -EIO;
2164         }
2165         return 0;
2166 }
2167
2168 /**
2169  * zfcp_fsf_exchange_port_data - request information about local port
2170  * @erp_action: ERP action for the adapter for which port data is requested
2171  */
2172 int
2173 zfcp_fsf_exchange_port_data(struct zfcp_erp_action *erp_action)
2174 {
2175         volatile struct qdio_buffer_element *sbale;
2176         struct zfcp_fsf_req *fsf_req;
2177         struct zfcp_adapter *adapter = erp_action->adapter;
2178         unsigned long lock_flags;
2179         int retval;
2180
2181         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT)) {
2182                 ZFCP_LOG_INFO("error: exchange port data "
2183                               "command not supported by adapter %s\n",
2184                               zfcp_get_busid_by_adapter(adapter));
2185                 return -EOPNOTSUPP;
2186         }
2187
2188         /* setup new FSF request */
2189         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA,
2190                                      ZFCP_REQ_AUTO_CLEANUP,
2191                                      adapter->pool.fsf_req_erp,
2192                                      &lock_flags, &fsf_req);
2193         if (retval) {
2194                 ZFCP_LOG_INFO("error: Out of resources. Could not create an "
2195                               "exchange port data request for "
2196                               "the adapter %s.\n",
2197                               zfcp_get_busid_by_adapter(adapter));
2198                 write_unlock_irqrestore(&adapter->request_queue.queue_lock,
2199                                         lock_flags);
2200                 return retval;
2201         }
2202
2203         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2204         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2205         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2206
2207         erp_action->fsf_req = fsf_req;
2208         fsf_req->erp_action = erp_action;
2209         zfcp_erp_start_timer(fsf_req);
2210
2211         retval = zfcp_fsf_req_send(fsf_req);
2212         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
2213
2214         if (retval) {
2215                 ZFCP_LOG_INFO("error: Could not send an exchange port data "
2216                               "command on the adapter %s\n",
2217                               zfcp_get_busid_by_adapter(adapter));
2218                 zfcp_fsf_req_free(fsf_req);
2219                 erp_action->fsf_req = NULL;
2220         }
2221         else
2222                 ZFCP_LOG_DEBUG("exchange port data request initiated "
2223                                "(adapter %s)\n",
2224                                zfcp_get_busid_by_adapter(adapter));
2225         return retval;
2226 }
2227
2228
2229 /**
2230  * zfcp_fsf_exchange_port_data_sync - request information about local port
2231  * and wait until information is ready
2232  */
2233 int
2234 zfcp_fsf_exchange_port_data_sync(struct zfcp_adapter *adapter,
2235                                 struct fsf_qtcb_bottom_port *data)
2236 {
2237         volatile struct qdio_buffer_element *sbale;
2238         struct zfcp_fsf_req *fsf_req;
2239         unsigned long lock_flags;
2240         int retval;
2241
2242         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT)) {
2243                 ZFCP_LOG_INFO("error: exchange port data "
2244                               "command not supported by adapter %s\n",
2245                               zfcp_get_busid_by_adapter(adapter));
2246                 return -EOPNOTSUPP;
2247         }
2248
2249         /* setup new FSF request */
2250         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA,
2251                                 0, NULL, &lock_flags, &fsf_req);
2252         if (retval) {
2253                 ZFCP_LOG_INFO("error: Out of resources. Could not create an "
2254                               "exchange port data request for "
2255                               "the adapter %s.\n",
2256                               zfcp_get_busid_by_adapter(adapter));
2257                 write_unlock_irqrestore(&adapter->request_queue.queue_lock,
2258                                         lock_flags);
2259                 return retval;
2260         }
2261
2262         if (data)
2263                 fsf_req->data = (unsigned long) data;
2264
2265         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2266         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2267         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2268
2269         zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
2270         retval = zfcp_fsf_req_send(fsf_req);
2271         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
2272
2273         if (retval)
2274                 ZFCP_LOG_INFO("error: Could not send an exchange port data "
2275                               "command on the adapter %s\n",
2276                               zfcp_get_busid_by_adapter(adapter));
2277         else
2278                 wait_event(fsf_req->completion_wq,
2279                            fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
2280
2281         zfcp_fsf_req_free(fsf_req);
2282
2283         return retval;
2284 }
2285
2286 /**
2287  * zfcp_fsf_exchange_port_evaluate
2288  * @fsf_req: fsf_req which belongs to xchg port data request
2289  * @xchg_ok: specifies if xchg port data was incomplete or complete (0/1)
2290  */
2291 static void
2292 zfcp_fsf_exchange_port_evaluate(struct zfcp_fsf_req *fsf_req, int xchg_ok)
2293 {
2294         struct zfcp_adapter *adapter;
2295         struct fsf_qtcb_bottom_port *bottom;
2296         struct Scsi_Host *shost;
2297
2298         adapter = fsf_req->adapter;
2299         bottom = &fsf_req->qtcb->bottom.port;
2300         shost = adapter->scsi_host;
2301
2302         if (fsf_req->data)
2303                 memcpy((struct fsf_qtcb_bottom_port*) fsf_req->data, bottom,
2304                         sizeof(struct fsf_qtcb_bottom_port));
2305
2306         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
2307                 fc_host_permanent_port_name(shost) = bottom->wwpn;
2308         else
2309                 fc_host_permanent_port_name(shost) = fc_host_port_name(shost);
2310         fc_host_maxframe_size(shost) = bottom->maximum_frame_size;
2311         fc_host_supported_speeds(shost) = bottom->supported_speed;
2312 }
2313
2314 /**
2315  * zfcp_fsf_exchange_port_data_handler - handler for exchange_port_data request
2316  * @fsf_req: pointer to struct zfcp_fsf_req
2317  */
2318 static void
2319 zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *fsf_req)
2320 {
2321         struct zfcp_adapter *adapter;
2322         struct fsf_qtcb *qtcb;
2323
2324         adapter = fsf_req->adapter;
2325         qtcb = fsf_req->qtcb;
2326
2327         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
2328                 return;
2329
2330         switch (qtcb->header.fsf_status) {
2331         case FSF_GOOD:
2332                 zfcp_fsf_exchange_port_evaluate(fsf_req, 1);
2333                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XPORT_OK, &adapter->status);
2334                 break;
2335         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
2336                 zfcp_fsf_exchange_port_evaluate(fsf_req, 0);
2337                 atomic_set_mask(ZFCP_STATUS_ADAPTER_XPORT_OK, &adapter->status);
2338                 zfcp_fsf_link_down_info_eval(fsf_req, 43,
2339                         &qtcb->header.fsf_status_qual.link_down_info);
2340                 break;
2341         }
2342 }
2343
2344
2345 /*
2346  * function:    zfcp_fsf_open_port
2347  *
2348  * purpose:
2349  *
2350  * returns:     address of initiated FSF request
2351  *              NULL - request could not be initiated
2352  */
2353 int
2354 zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
2355 {
2356         volatile struct qdio_buffer_element *sbale;
2357         struct zfcp_fsf_req *fsf_req;
2358         unsigned long lock_flags;
2359         int retval = 0;
2360
2361         /* setup new FSF request */
2362         retval = zfcp_fsf_req_create(erp_action->adapter,
2363                                      FSF_QTCB_OPEN_PORT_WITH_DID,
2364                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2365                                      erp_action->adapter->pool.fsf_req_erp,
2366                                      &lock_flags, &fsf_req);
2367         if (retval < 0) {
2368                 ZFCP_LOG_INFO("error: Could not create open port request "
2369                               "for port 0x%016Lx on adapter %s.\n",
2370                               erp_action->port->wwpn,
2371                               zfcp_get_busid_by_adapter(erp_action->adapter));
2372                 goto out;
2373         }
2374
2375         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2376         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2377         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2378
2379         fsf_req->qtcb->bottom.support.d_id = erp_action->port->d_id;
2380         atomic_set_mask(ZFCP_STATUS_COMMON_OPENING, &erp_action->port->status);
2381         fsf_req->data = (unsigned long) erp_action->port;
2382         fsf_req->erp_action = erp_action;
2383         erp_action->fsf_req = fsf_req;
2384
2385         zfcp_erp_start_timer(fsf_req);
2386         retval = zfcp_fsf_req_send(fsf_req);
2387         if (retval) {
2388                 ZFCP_LOG_INFO("error: Could not send open port request for "
2389                               "port 0x%016Lx on adapter %s.\n",
2390                               erp_action->port->wwpn,
2391                               zfcp_get_busid_by_adapter(erp_action->adapter));
2392                 zfcp_fsf_req_free(fsf_req);
2393                 erp_action->fsf_req = NULL;
2394                 goto out;
2395         }
2396
2397         ZFCP_LOG_DEBUG("open port request initiated "
2398                        "(adapter %s,  port 0x%016Lx)\n",
2399                        zfcp_get_busid_by_adapter(erp_action->adapter),
2400                        erp_action->port->wwpn);
2401  out:
2402         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2403                                 lock_flags);
2404         return retval;
2405 }
2406
2407 /*
2408  * function:    zfcp_fsf_open_port_handler
2409  *
2410  * purpose:     is called for finished Open Port command
2411  *
2412  * returns:
2413  */
2414 static int
2415 zfcp_fsf_open_port_handler(struct zfcp_fsf_req *fsf_req)
2416 {
2417         int retval = -EINVAL;
2418         struct zfcp_port *port;
2419         struct fsf_plogi *plogi;
2420         struct fsf_qtcb_header *header;
2421         u16 subtable, rule, counter;
2422
2423         port = (struct zfcp_port *) fsf_req->data;
2424         header = &fsf_req->qtcb->header;
2425
2426         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2427                 /* don't change port status in our bookkeeping */
2428                 goto skip_fsfstatus;
2429         }
2430
2431         /* evaluate FSF status in QTCB */
2432         switch (header->fsf_status) {
2433
2434         case FSF_PORT_ALREADY_OPEN:
2435                 ZFCP_LOG_NORMAL("bug: remote port 0x%016Lx on adapter %s "
2436                                 "is already open.\n",
2437                                 port->wwpn, zfcp_get_busid_by_port(port));
2438                 /*
2439                  * This is a bug, however operation should continue normally
2440                  * if it is simply ignored
2441                  */
2442                 break;
2443
2444         case FSF_ACCESS_DENIED:
2445                 ZFCP_LOG_NORMAL("Access denied, cannot open port 0x%016Lx "
2446                                 "on adapter %s\n",
2447                                 port->wwpn, zfcp_get_busid_by_port(port));
2448                 for (counter = 0; counter < 2; counter++) {
2449                         subtable = header->fsf_status_qual.halfword[counter * 2];
2450                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
2451                         switch (subtable) {
2452                         case FSF_SQ_CFDC_SUBTABLE_OS:
2453                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
2454                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
2455                         case FSF_SQ_CFDC_SUBTABLE_LUN:
2456                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
2457                                         zfcp_act_subtable_type[subtable], rule);
2458                                 break;
2459                         }
2460                 }
2461                 zfcp_erp_port_access_denied(port, 57, (u64)fsf_req);
2462                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2463                 break;
2464
2465         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
2466                 ZFCP_LOG_INFO("error: The FSF adapter is out of resources. "
2467                               "The remote port 0x%016Lx on adapter %s "
2468                               "could not be opened. Disabling it.\n",
2469                               port->wwpn, zfcp_get_busid_by_port(port));
2470                 zfcp_erp_port_failed(port, 31, (u64)fsf_req);
2471                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2472                 break;
2473
2474         case FSF_ADAPTER_STATUS_AVAILABLE:
2475                 switch (header->fsf_status_qual.word[0]) {
2476                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
2477                         /* ERP strategy will escalate */
2478                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2479                         break;
2480                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
2481                         /* ERP strategy will escalate */
2482                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2483                         break;
2484                 case FSF_SQ_NO_RETRY_POSSIBLE:
2485                         ZFCP_LOG_NORMAL("The remote port 0x%016Lx on "
2486                                         "adapter %s could not be opened. "
2487                                         "Disabling it.\n",
2488                                         port->wwpn,
2489                                         zfcp_get_busid_by_port(port));
2490                         zfcp_erp_port_failed(port, 32, (u64)fsf_req);
2491                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2492                         break;
2493                 default:
2494                         ZFCP_LOG_NORMAL
2495                             ("bug: Wrong status qualifier 0x%x arrived.\n",
2496                              header->fsf_status_qual.word[0]);
2497                         break;
2498                 }
2499                 break;
2500
2501         case FSF_GOOD:
2502                 /* save port handle assigned by FSF */
2503                 port->handle = header->port_handle;
2504                 ZFCP_LOG_INFO("The remote port 0x%016Lx via adapter %s "
2505                               "was opened, it's port handle is 0x%x\n",
2506                               port->wwpn, zfcp_get_busid_by_port(port),
2507                               port->handle);
2508                 /* mark port as open */
2509                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN |
2510                                 ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
2511                 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
2512                                   ZFCP_STATUS_COMMON_ACCESS_BOXED,
2513                                   &port->status);
2514                 retval = 0;
2515                 /* check whether D_ID has changed during open */
2516                 /*
2517                  * FIXME: This check is not airtight, as the FCP channel does
2518                  * not monitor closures of target port connections caused on
2519                  * the remote side. Thus, they might miss out on invalidating
2520                  * locally cached WWPNs (and other N_Port parameters) of gone
2521                  * target ports. So, our heroic attempt to make things safe
2522                  * could be undermined by 'open port' response data tagged with
2523                  * obsolete WWPNs. Another reason to monitor potential
2524                  * connection closures ourself at least (by interpreting
2525                  * incoming ELS' and unsolicited status). It just crosses my
2526                  * mind that one should be able to cross-check by means of
2527                  * another GID_PN straight after a port has been opened.
2528                  * Alternately, an ADISC/PDISC ELS should suffice, as well.
2529                  */
2530                 plogi = (struct fsf_plogi *) fsf_req->qtcb->bottom.support.els;
2531                 if (!atomic_test_mask(ZFCP_STATUS_PORT_NO_WWPN, &port->status))
2532                 {
2533                         if (fsf_req->qtcb->bottom.support.els1_length <
2534                             sizeof (struct fsf_plogi)) {
2535                                 ZFCP_LOG_INFO(
2536                                         "warning: insufficient length of "
2537                                         "PLOGI payload (%i)\n",
2538                                         fsf_req->qtcb->bottom.support.els1_length);
2539                                 /* skip sanity check and assume wwpn is ok */
2540                         } else {
2541                                 if (plogi->serv_param.wwpn != port->wwpn) {
2542                                         ZFCP_LOG_INFO("warning: d_id of port "
2543                                                       "0x%016Lx changed during "
2544                                                       "open\n", port->wwpn);
2545                                         atomic_clear_mask(
2546                                                 ZFCP_STATUS_PORT_DID_DID,
2547                                                 &port->status);
2548                                 } else {
2549                                         port->wwnn = plogi->serv_param.wwnn;
2550                                         zfcp_plogi_evaluate(port, plogi);
2551                                 }
2552                         }
2553                 }
2554                 break;
2555
2556         case FSF_UNKNOWN_OP_SUBTYPE:
2557                 /* should never occure, subtype not set in zfcp_fsf_open_port */
2558                 ZFCP_LOG_INFO("unknown operation subtype (adapter: %s, "
2559                               "op_subtype=0x%x)\n",
2560                               zfcp_get_busid_by_port(port),
2561                               fsf_req->qtcb->bottom.support.operation_subtype);
2562                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2563                 break;
2564
2565         default:
2566                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
2567                                 "(debug info 0x%x)\n",
2568                                 header->fsf_status);
2569                 break;
2570         }
2571
2572  skip_fsfstatus:
2573         atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING, &port->status);
2574         return retval;
2575 }
2576
2577 /*
2578  * function:    zfcp_fsf_close_port
2579  *
2580  * purpose:     submit FSF command "close port"
2581  *
2582  * returns:     address of initiated FSF request
2583  *              NULL - request could not be initiated
2584  */
2585 int
2586 zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
2587 {
2588         volatile struct qdio_buffer_element *sbale;
2589         struct zfcp_fsf_req *fsf_req;
2590         unsigned long lock_flags;
2591         int retval = 0;
2592
2593         /* setup new FSF request */
2594         retval = zfcp_fsf_req_create(erp_action->adapter,
2595                                      FSF_QTCB_CLOSE_PORT,
2596                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2597                                      erp_action->adapter->pool.fsf_req_erp,
2598                                      &lock_flags, &fsf_req);
2599         if (retval < 0) {
2600                 ZFCP_LOG_INFO("error: Could not create a close port request "
2601                               "for port 0x%016Lx on adapter %s.\n",
2602                               erp_action->port->wwpn,
2603                               zfcp_get_busid_by_adapter(erp_action->adapter));
2604                 goto out;
2605         }
2606
2607         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2608         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2609         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2610
2611         atomic_set_mask(ZFCP_STATUS_COMMON_CLOSING, &erp_action->port->status);
2612         fsf_req->data = (unsigned long) erp_action->port;
2613         fsf_req->erp_action = erp_action;
2614         fsf_req->qtcb->header.port_handle = erp_action->port->handle;
2615         fsf_req->erp_action = erp_action;
2616         erp_action->fsf_req = fsf_req;
2617
2618         zfcp_erp_start_timer(fsf_req);
2619         retval = zfcp_fsf_req_send(fsf_req);
2620         if (retval) {
2621                 ZFCP_LOG_INFO("error: Could not send a close port request for "
2622                               "port 0x%016Lx on adapter %s.\n",
2623                               erp_action->port->wwpn,
2624                               zfcp_get_busid_by_adapter(erp_action->adapter));
2625                 zfcp_fsf_req_free(fsf_req);
2626                 erp_action->fsf_req = NULL;
2627                 goto out;
2628         }
2629
2630         ZFCP_LOG_TRACE("close port request initiated "
2631                        "(adapter %s, port 0x%016Lx)\n",
2632                        zfcp_get_busid_by_adapter(erp_action->adapter),
2633                        erp_action->port->wwpn);
2634  out:
2635         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2636                                 lock_flags);
2637         return retval;
2638 }
2639
2640 /*
2641  * function:    zfcp_fsf_close_port_handler
2642  *
2643  * purpose:     is called for finished Close Port FSF command
2644  *
2645  * returns:
2646  */
2647 static int
2648 zfcp_fsf_close_port_handler(struct zfcp_fsf_req *fsf_req)
2649 {
2650         int retval = -EINVAL;
2651         struct zfcp_port *port;
2652
2653         port = (struct zfcp_port *) fsf_req->data;
2654
2655         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2656                 /* don't change port status in our bookkeeping */
2657                 goto skip_fsfstatus;
2658         }
2659
2660         /* evaluate FSF status in QTCB */
2661         switch (fsf_req->qtcb->header.fsf_status) {
2662
2663         case FSF_PORT_HANDLE_NOT_VALID:
2664                 ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
2665                               "0x%016Lx on adapter %s invalid. This may happen "
2666                               "occasionally.\n", port->handle,
2667                               port->wwpn, zfcp_get_busid_by_port(port));
2668                 ZFCP_LOG_DEBUG("status qualifier:\n");
2669                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
2670                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
2671                               sizeof (union fsf_status_qual));
2672                 zfcp_erp_adapter_reopen(port->adapter, 0, 107, (u64)fsf_req);
2673                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2674                 break;
2675
2676         case FSF_ADAPTER_STATUS_AVAILABLE:
2677                 /* Note: FSF has actually closed the port in this case.
2678                  * The status code is just daft. Fingers crossed for a change
2679                  */
2680                 retval = 0;
2681                 break;
2682
2683         case FSF_GOOD:
2684                 ZFCP_LOG_TRACE("remote port 0x016%Lx on adapter %s closed, "
2685                                "port handle 0x%x\n", port->wwpn,
2686                                zfcp_get_busid_by_port(port), port->handle);
2687                 zfcp_erp_modify_port_status(port, 33, (u64)fsf_req,
2688                                             ZFCP_STATUS_COMMON_OPEN,
2689                                             ZFCP_CLEAR);
2690                 retval = 0;
2691                 break;
2692
2693         default:
2694                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
2695                                 "(debug info 0x%x)\n",
2696                                 fsf_req->qtcb->header.fsf_status);
2697                 break;
2698         }
2699
2700  skip_fsfstatus:
2701         atomic_clear_mask(ZFCP_STATUS_COMMON_CLOSING, &port->status);
2702         return retval;
2703 }
2704
2705 /*
2706  * function:    zfcp_fsf_close_physical_port
2707  *
2708  * purpose:     submit FSF command "close physical port"
2709  *
2710  * returns:     address of initiated FSF request
2711  *              NULL - request could not be initiated
2712  */
2713 int
2714 zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
2715 {
2716         volatile struct qdio_buffer_element *sbale;
2717         struct zfcp_fsf_req *fsf_req;
2718         unsigned long lock_flags;
2719         int retval = 0;
2720
2721         /* setup new FSF request */
2722         retval = zfcp_fsf_req_create(erp_action->adapter,
2723                                      FSF_QTCB_CLOSE_PHYSICAL_PORT,
2724                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2725                                      erp_action->adapter->pool.fsf_req_erp,
2726                                      &lock_flags, &fsf_req);
2727         if (retval < 0) {
2728                 ZFCP_LOG_INFO("error: Could not create close physical port "
2729                               "request (adapter %s, port 0x%016Lx)\n",
2730                               zfcp_get_busid_by_adapter(erp_action->adapter),
2731                               erp_action->port->wwpn);
2732
2733                 goto out;
2734         }
2735
2736         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2737         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2738         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2739
2740         /* mark port as being closed */
2741         atomic_set_mask(ZFCP_STATUS_PORT_PHYS_CLOSING,
2742                         &erp_action->port->status);
2743         /* save a pointer to this port */
2744         fsf_req->data = (unsigned long) erp_action->port;
2745         fsf_req->qtcb->header.port_handle = erp_action->port->handle;
2746         fsf_req->erp_action = erp_action;
2747         erp_action->fsf_req = fsf_req;
2748
2749         zfcp_erp_start_timer(fsf_req);
2750         retval = zfcp_fsf_req_send(fsf_req);
2751         if (retval) {
2752                 ZFCP_LOG_INFO("error: Could not send close physical port "
2753                               "request (adapter %s, port 0x%016Lx)\n",
2754                               zfcp_get_busid_by_adapter(erp_action->adapter),
2755                               erp_action->port->wwpn);
2756                 zfcp_fsf_req_free(fsf_req);
2757                 erp_action->fsf_req = NULL;
2758                 goto out;
2759         }
2760
2761         ZFCP_LOG_TRACE("close physical port request initiated "
2762                        "(adapter %s, port 0x%016Lx)\n",
2763                        zfcp_get_busid_by_adapter(erp_action->adapter),
2764                        erp_action->port->wwpn);
2765  out:
2766         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2767                                 lock_flags);
2768         return retval;
2769 }
2770
2771 /*
2772  * function:    zfcp_fsf_close_physical_port_handler
2773  *
2774  * purpose:     is called for finished Close Physical Port FSF command
2775  *
2776  * returns:
2777  */
2778 static int
2779 zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *fsf_req)
2780 {
2781         int retval = -EINVAL;
2782         struct zfcp_port *port;
2783         struct zfcp_unit *unit;
2784         struct fsf_qtcb_header *header;
2785         u16 subtable, rule, counter;
2786
2787         port = (struct zfcp_port *) fsf_req->data;
2788         header = &fsf_req->qtcb->header;
2789
2790         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2791                 /* don't change port status in our bookkeeping */
2792                 goto skip_fsfstatus;
2793         }
2794
2795         /* evaluate FSF status in QTCB */
2796         switch (header->fsf_status) {
2797
2798         case FSF_PORT_HANDLE_NOT_VALID:
2799                 ZFCP_LOG_INFO("Temporary port identifier 0x%x invalid"
2800                               "(adapter %s, port 0x%016Lx). "
2801                               "This may happen occasionally.\n",
2802                               port->handle,
2803                               zfcp_get_busid_by_port(port),
2804                               port->wwpn);
2805                 ZFCP_LOG_DEBUG("status qualifier:\n");
2806                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
2807                               (char *) &header->fsf_status_qual,
2808                               sizeof (union fsf_status_qual));
2809                 zfcp_erp_adapter_reopen(port->adapter, 0, 108, (u64)fsf_req);
2810                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2811                 break;
2812
2813         case FSF_ACCESS_DENIED:
2814                 ZFCP_LOG_NORMAL("Access denied, cannot close "
2815                                 "physical port 0x%016Lx on adapter %s\n",
2816                                 port->wwpn, zfcp_get_busid_by_port(port));
2817                 for (counter = 0; counter < 2; counter++) {
2818                         subtable = header->fsf_status_qual.halfword[counter * 2];
2819                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
2820                         switch (subtable) {
2821                         case FSF_SQ_CFDC_SUBTABLE_OS:
2822                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
2823                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
2824                         case FSF_SQ_CFDC_SUBTABLE_LUN:
2825                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
2826                                         zfcp_act_subtable_type[subtable], rule);
2827                                 break;
2828                         }
2829                 }
2830                 zfcp_erp_port_access_denied(port, 58, (u64)fsf_req);
2831                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2832                 break;
2833
2834         case FSF_PORT_BOXED:
2835                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter "
2836                                "%s needs to be reopened but it was attempted "
2837                                "to close it physically.\n",
2838                                port->wwpn,
2839                                zfcp_get_busid_by_port(port));
2840                 zfcp_erp_port_boxed(port, 50, (u64)fsf_req);
2841                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
2842                         ZFCP_STATUS_FSFREQ_RETRY;
2843
2844                 /* can't use generic zfcp_erp_modify_port_status because
2845                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port */
2846                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
2847                 list_for_each_entry(unit, &port->unit_list_head, list)
2848                         atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
2849                                           &unit->status);
2850                 break;
2851
2852         case FSF_ADAPTER_STATUS_AVAILABLE:
2853                 switch (header->fsf_status_qual.word[0]) {
2854                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
2855                         /* This will now be escalated by ERP */
2856                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2857                         break;
2858                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
2859                         /* ERP strategy will escalate */
2860                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2861                         break;
2862                 default:
2863                         ZFCP_LOG_NORMAL
2864                             ("bug: Wrong status qualifier 0x%x arrived.\n",
2865                              header->fsf_status_qual.word[0]);
2866                         break;
2867                 }
2868                 break;
2869
2870         case FSF_GOOD:
2871                 ZFCP_LOG_DEBUG("Remote port 0x%016Lx via adapter %s "
2872                                "physically closed, port handle 0x%x\n",
2873                                port->wwpn,
2874                                zfcp_get_busid_by_port(port), port->handle);
2875                 /* can't use generic zfcp_erp_modify_port_status because
2876                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port
2877                  */
2878                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
2879                 list_for_each_entry(unit, &port->unit_list_head, list)
2880                     atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
2881                 retval = 0;
2882                 break;
2883
2884         default:
2885                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
2886                                 "(debug info 0x%x)\n",
2887                                 header->fsf_status);
2888                 break;
2889         }
2890
2891  skip_fsfstatus:
2892         atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_CLOSING, &port->status);
2893         return retval;
2894 }
2895
2896 /*
2897  * function:    zfcp_fsf_open_unit
2898  *
2899  * purpose:
2900  *
2901  * returns:
2902  *
2903  * assumptions: This routine does not check whether the associated
2904  *              remote port has already been opened. This should be
2905  *              done by calling routines. Otherwise some status
2906  *              may be presented by FSF
2907  */
2908 int
2909 zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
2910 {
2911         volatile struct qdio_buffer_element *sbale;
2912         struct zfcp_fsf_req *fsf_req;
2913         unsigned long lock_flags;
2914         int retval = 0;
2915
2916         /* setup new FSF request */
2917         retval = zfcp_fsf_req_create(erp_action->adapter,
2918                                      FSF_QTCB_OPEN_LUN,
2919                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
2920                                      erp_action->adapter->pool.fsf_req_erp,
2921                                      &lock_flags, &fsf_req);
2922         if (retval < 0) {
2923                 ZFCP_LOG_INFO("error: Could not create open unit request for "
2924                               "unit 0x%016Lx on port 0x%016Lx on adapter %s.\n",
2925                               erp_action->unit->fcp_lun,
2926                               erp_action->unit->port->wwpn,
2927                               zfcp_get_busid_by_adapter(erp_action->adapter));
2928                 goto out;
2929         }
2930
2931         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
2932         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
2933         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
2934
2935         fsf_req->qtcb->header.port_handle = erp_action->port->handle;
2936         fsf_req->qtcb->bottom.support.fcp_lun = erp_action->unit->fcp_lun;
2937         if (!(erp_action->adapter->connection_features & FSF_FEATURE_NPIV_MODE))
2938                 fsf_req->qtcb->bottom.support.option =
2939                         FSF_OPEN_LUN_SUPPRESS_BOXING;
2940         atomic_set_mask(ZFCP_STATUS_COMMON_OPENING, &erp_action->unit->status);
2941         fsf_req->data = (unsigned long) erp_action->unit;
2942         fsf_req->erp_action = erp_action;
2943         erp_action->fsf_req = fsf_req;
2944
2945         zfcp_erp_start_timer(fsf_req);
2946         retval = zfcp_fsf_req_send(erp_action->fsf_req);
2947         if (retval) {
2948                 ZFCP_LOG_INFO("error: Could not send an open unit request "
2949                               "on the adapter %s, port 0x%016Lx for "
2950                               "unit 0x%016Lx\n",
2951                               zfcp_get_busid_by_adapter(erp_action->adapter),
2952                               erp_action->port->wwpn,
2953                               erp_action->unit->fcp_lun);
2954                 zfcp_fsf_req_free(fsf_req);
2955                 erp_action->fsf_req = NULL;
2956                 goto out;
2957         }
2958
2959         ZFCP_LOG_TRACE("Open LUN request initiated (adapter %s, "
2960                        "port 0x%016Lx, unit 0x%016Lx)\n",
2961                        zfcp_get_busid_by_adapter(erp_action->adapter),
2962                        erp_action->port->wwpn, erp_action->unit->fcp_lun);
2963  out:
2964         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
2965                                 lock_flags);
2966         return retval;
2967 }
2968
2969 /*
2970  * function:    zfcp_fsf_open_unit_handler
2971  *
2972  * purpose:     is called for finished Open LUN command
2973  *
2974  * returns:
2975  */
2976 static int
2977 zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *fsf_req)
2978 {
2979         int retval = -EINVAL;
2980         struct zfcp_adapter *adapter;
2981         struct zfcp_unit *unit;
2982         struct fsf_qtcb_header *header;
2983         struct fsf_qtcb_bottom_support *bottom;
2984         struct fsf_queue_designator *queue_designator;
2985         u16 subtable, rule, counter;
2986         int exclusive, readwrite;
2987
2988         unit = (struct zfcp_unit *) fsf_req->data;
2989
2990         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
2991                 /* don't change unit status in our bookkeeping */
2992                 goto skip_fsfstatus;
2993         }
2994
2995         adapter = fsf_req->adapter;
2996         header = &fsf_req->qtcb->header;
2997         bottom = &fsf_req->qtcb->bottom.support;
2998         queue_designator = &header->fsf_status_qual.fsf_queue_designator;
2999
3000         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
3001                           ZFCP_STATUS_COMMON_ACCESS_BOXED |
3002                           ZFCP_STATUS_UNIT_SHARED |
3003                           ZFCP_STATUS_UNIT_READONLY,
3004                           &unit->status);
3005
3006         /* evaluate FSF status in QTCB */
3007         switch (header->fsf_status) {
3008
3009         case FSF_PORT_HANDLE_NOT_VALID:
3010                 ZFCP_LOG_INFO("Temporary port identifier 0x%x "
3011                               "for port 0x%016Lx on adapter %s invalid "
3012                               "This may happen occasionally\n",
3013                               unit->port->handle,
3014                               unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3015                 ZFCP_LOG_DEBUG("status qualifier:\n");
3016                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3017                               (char *) &header->fsf_status_qual,
3018                               sizeof (union fsf_status_qual));
3019                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 109,
3020                                         (u64)fsf_req);
3021                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3022                 break;
3023
3024         case FSF_LUN_ALREADY_OPEN:
3025                 ZFCP_LOG_NORMAL("bug: Attempted to open unit 0x%016Lx on "
3026                                 "remote port 0x%016Lx on adapter %s twice.\n",
3027                                 unit->fcp_lun,
3028                                 unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3029                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3030                 break;
3031
3032         case FSF_ACCESS_DENIED:
3033                 ZFCP_LOG_NORMAL("Access denied, cannot open unit 0x%016Lx on "
3034                                 "remote port 0x%016Lx on adapter %s\n",
3035                                 unit->fcp_lun, unit->port->wwpn,
3036                                 zfcp_get_busid_by_unit(unit));
3037                 for (counter = 0; counter < 2; counter++) {
3038                         subtable = header->fsf_status_qual.halfword[counter * 2];
3039                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
3040                         switch (subtable) {
3041                         case FSF_SQ_CFDC_SUBTABLE_OS:
3042                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
3043                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
3044                         case FSF_SQ_CFDC_SUBTABLE_LUN:
3045                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
3046                                         zfcp_act_subtable_type[subtable], rule);
3047                                 break;
3048                         }
3049                 }
3050                 zfcp_erp_unit_access_denied(unit, 59, (u64)fsf_req);
3051                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
3052                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
3053                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3054                 break;
3055
3056         case FSF_PORT_BOXED:
3057                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
3058                                "needs to be reopened\n",
3059                                unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3060                 zfcp_erp_port_boxed(unit->port, 51, (u64)fsf_req);
3061                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
3062                         ZFCP_STATUS_FSFREQ_RETRY;
3063                 break;
3064
3065         case FSF_LUN_SHARING_VIOLATION:
3066                 if (header->fsf_status_qual.word[0] != 0) {
3067                         ZFCP_LOG_NORMAL("FCP-LUN 0x%Lx at the remote port "
3068                                         "with WWPN 0x%Lx "
3069                                         "connected to the adapter %s "
3070                                         "is already in use in LPAR%d, CSS%d\n",
3071                                         unit->fcp_lun,
3072                                         unit->port->wwpn,
3073                                         zfcp_get_busid_by_unit(unit),
3074                                         queue_designator->hla,
3075                                         queue_designator->cssid);
3076                 } else {
3077                         subtable = header->fsf_status_qual.halfword[4];
3078                         rule = header->fsf_status_qual.halfword[5];
3079                         switch (subtable) {
3080                         case FSF_SQ_CFDC_SUBTABLE_OS:
3081                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
3082                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
3083                         case FSF_SQ_CFDC_SUBTABLE_LUN:
3084                                 ZFCP_LOG_NORMAL("Access to FCP-LUN 0x%Lx at the "
3085                                                 "remote port with WWPN 0x%Lx "
3086                                                 "connected to the adapter %s "
3087                                                 "is denied (%s rule %d)\n",
3088                                                 unit->fcp_lun,
3089                                                 unit->port->wwpn,
3090                                                 zfcp_get_busid_by_unit(unit),
3091                                                 zfcp_act_subtable_type[subtable],
3092                                                 rule);
3093                                 break;
3094                         }
3095                 }
3096                 ZFCP_LOG_DEBUG("status qualifier:\n");
3097                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3098                               (char *) &header->fsf_status_qual,
3099                               sizeof (union fsf_status_qual));
3100                 zfcp_erp_unit_access_denied(unit, 60, (u64)fsf_req);
3101                 atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
3102                 atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
3103                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3104                 break;
3105
3106         case FSF_MAXIMUM_NUMBER_OF_LUNS_EXCEEDED:
3107                 ZFCP_LOG_INFO("error: The adapter ran out of resources. "
3108                               "There is no handle (temporary port identifier) "
3109                               "available for unit 0x%016Lx on port 0x%016Lx "
3110                               "on adapter %s\n",
3111                               unit->fcp_lun,
3112                               unit->port->wwpn,
3113                               zfcp_get_busid_by_unit(unit));
3114                 zfcp_erp_unit_failed(unit, 34, (u64)fsf_req);
3115                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3116                 break;
3117
3118         case FSF_ADAPTER_STATUS_AVAILABLE:
3119                 switch (header->fsf_status_qual.word[0]) {
3120                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
3121                         /* Re-establish link to port */
3122                         zfcp_test_link(unit->port);
3123                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3124                         break;
3125                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
3126                         /* ERP strategy will escalate */
3127                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3128                         break;
3129                 default:
3130                         ZFCP_LOG_NORMAL
3131                             ("bug: Wrong status qualifier 0x%x arrived.\n",
3132                              header->fsf_status_qual.word[0]);
3133                 }
3134                 break;
3135
3136         case FSF_INVALID_COMMAND_OPTION:
3137                 ZFCP_LOG_NORMAL(
3138                         "Invalid option 0x%x has been specified "
3139                         "in QTCB bottom sent to the adapter %s\n",
3140                         bottom->option,
3141                         zfcp_get_busid_by_adapter(adapter));
3142                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3143                 retval = -EINVAL;
3144                 break;
3145
3146         case FSF_GOOD:
3147                 /* save LUN handle assigned by FSF */
3148                 unit->handle = header->lun_handle;
3149                 ZFCP_LOG_TRACE("unit 0x%016Lx on remote port 0x%016Lx on "
3150                                "adapter %s opened, port handle 0x%x\n",
3151                                unit->fcp_lun,
3152                                unit->port->wwpn,
3153                                zfcp_get_busid_by_unit(unit),
3154                                unit->handle);
3155                 /* mark unit as open */
3156                 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
3157
3158                 if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE) &&
3159                     (adapter->adapter_features & FSF_FEATURE_LUN_SHARING) &&
3160                     (adapter->ccw_device->id.dev_model != ZFCP_DEVICE_MODEL_PRIV)) {
3161                         exclusive = (bottom->lun_access_info &
3162                                         FSF_UNIT_ACCESS_EXCLUSIVE);
3163                         readwrite = (bottom->lun_access_info &
3164                                         FSF_UNIT_ACCESS_OUTBOUND_TRANSFER);
3165
3166                         if (!exclusive)
3167                                 atomic_set_mask(ZFCP_STATUS_UNIT_SHARED,
3168                                                 &unit->status);
3169
3170                         if (!readwrite) {
3171                                 atomic_set_mask(ZFCP_STATUS_UNIT_READONLY,
3172                                                 &unit->status);
3173                                 ZFCP_LOG_NORMAL("read-only access for unit "
3174                                                 "(adapter %s, wwpn=0x%016Lx, "
3175                                                 "fcp_lun=0x%016Lx)\n",
3176                                                 zfcp_get_busid_by_unit(unit),
3177                                                 unit->port->wwpn,
3178                                                 unit->fcp_lun);
3179                         }
3180
3181                         if (exclusive && !readwrite) {
3182                                 ZFCP_LOG_NORMAL("exclusive access of read-only "
3183                                                 "unit not supported\n");
3184                                 zfcp_erp_unit_failed(unit, 35, (u64)fsf_req);
3185                                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3186                                 zfcp_erp_unit_shutdown(unit, 0, 80,
3187                                                        (u64)fsf_req);
3188                         } else if (!exclusive && readwrite) {
3189                                 ZFCP_LOG_NORMAL("shared access of read-write "
3190                                                 "unit not supported\n");
3191                                 zfcp_erp_unit_failed(unit, 36, (u64)fsf_req);
3192                                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3193                                 zfcp_erp_unit_shutdown(unit, 0, 81,
3194                                                        (u64)fsf_req);
3195                         }
3196                 }
3197
3198                 retval = 0;
3199                 break;
3200
3201         default:
3202                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
3203                                 "(debug info 0x%x)\n",
3204                                 header->fsf_status);
3205                 break;
3206         }
3207
3208  skip_fsfstatus:
3209         atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING, &unit->status);
3210         return retval;
3211 }
3212
3213 /*
3214  * function:    zfcp_fsf_close_unit
3215  *
3216  * purpose:
3217  *
3218  * returns:     address of fsf_req - request successfully initiated
3219  *              NULL -
3220  *
3221  * assumptions: This routine does not check whether the associated
3222  *              remote port/lun has already been opened. This should be
3223  *              done by calling routines. Otherwise some status
3224  *              may be presented by FSF
3225  */
3226 int
3227 zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
3228 {
3229         volatile struct qdio_buffer_element *sbale;
3230         struct zfcp_fsf_req *fsf_req;
3231         unsigned long lock_flags;
3232         int retval = 0;
3233
3234         /* setup new FSF request */
3235         retval = zfcp_fsf_req_create(erp_action->adapter,
3236                                      FSF_QTCB_CLOSE_LUN,
3237                                      ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
3238                                      erp_action->adapter->pool.fsf_req_erp,
3239                                      &lock_flags, &fsf_req);
3240         if (retval < 0) {
3241                 ZFCP_LOG_INFO("error: Could not create close unit request for "
3242                               "unit 0x%016Lx on port 0x%016Lx on adapter %s.\n",
3243                               erp_action->unit->fcp_lun,
3244                               erp_action->port->wwpn,
3245                               zfcp_get_busid_by_adapter(erp_action->adapter));
3246                 goto out;
3247         }
3248
3249         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
3250         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
3251         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
3252
3253         fsf_req->qtcb->header.port_handle = erp_action->port->handle;
3254         fsf_req->qtcb->header.lun_handle = erp_action->unit->handle;
3255         atomic_set_mask(ZFCP_STATUS_COMMON_CLOSING, &erp_action->unit->status);
3256         fsf_req->data = (unsigned long) erp_action->unit;
3257         fsf_req->erp_action = erp_action;
3258         erp_action->fsf_req = fsf_req;
3259
3260         zfcp_erp_start_timer(fsf_req);
3261         retval = zfcp_fsf_req_send(erp_action->fsf_req);
3262         if (retval) {
3263                 ZFCP_LOG_INFO("error: Could not send a close unit request for "
3264                               "unit 0x%016Lx on port 0x%016Lx onadapter %s.\n",
3265                               erp_action->unit->fcp_lun,
3266                               erp_action->port->wwpn,
3267                               zfcp_get_busid_by_adapter(erp_action->adapter));
3268                 zfcp_fsf_req_free(fsf_req);
3269                 erp_action->fsf_req = NULL;
3270                 goto out;
3271         }
3272
3273         ZFCP_LOG_TRACE("Close LUN request initiated (adapter %s, "
3274                        "port 0x%016Lx, unit 0x%016Lx)\n",
3275                        zfcp_get_busid_by_adapter(erp_action->adapter),
3276                        erp_action->port->wwpn, erp_action->unit->fcp_lun);
3277  out:
3278         write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
3279                                 lock_flags);
3280         return retval;
3281 }
3282
3283 /*
3284  * function:    zfcp_fsf_close_unit_handler
3285  *
3286  * purpose:     is called for finished Close LUN FSF command
3287  *
3288  * returns:
3289  */
3290 static int
3291 zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *fsf_req)
3292 {
3293         int retval = -EINVAL;
3294         struct zfcp_unit *unit;
3295
3296         unit = (struct zfcp_unit *) fsf_req->data;
3297
3298         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
3299                 /* don't change unit status in our bookkeeping */
3300                 goto skip_fsfstatus;
3301         }
3302
3303         /* evaluate FSF status in QTCB */
3304         switch (fsf_req->qtcb->header.fsf_status) {
3305
3306         case FSF_PORT_HANDLE_NOT_VALID:
3307                 ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
3308                               "0x%016Lx on adapter %s invalid. This may "
3309                               "happen in rare circumstances\n",
3310                               unit->port->handle,
3311                               unit->port->wwpn,
3312                               zfcp_get_busid_by_unit(unit));
3313                 ZFCP_LOG_DEBUG("status qualifier:\n");
3314                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3315                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
3316                               sizeof (union fsf_status_qual));
3317                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 110,
3318                                         (u64)fsf_req);
3319                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3320                 break;
3321
3322         case FSF_LUN_HANDLE_NOT_VALID:
3323                 ZFCP_LOG_INFO("Temporary LUN identifier 0x%x of unit "
3324                               "0x%016Lx on port 0x%016Lx on adapter %s is "
3325                               "invalid. This may happen occasionally.\n",
3326                               unit->handle,
3327                               unit->fcp_lun,
3328                               unit->port->wwpn,
3329                               zfcp_get_busid_by_unit(unit));
3330                 ZFCP_LOG_DEBUG("Status qualifier data:\n");
3331                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3332                               (char *) &fsf_req->qtcb->header.fsf_status_qual,
3333                               sizeof (union fsf_status_qual));
3334                 zfcp_erp_port_reopen(unit->port, 0, 111, (u64)fsf_req);
3335                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3336                 break;
3337
3338         case FSF_PORT_BOXED:
3339                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
3340                                "needs to be reopened\n",
3341                                unit->port->wwpn,
3342                                zfcp_get_busid_by_unit(unit));
3343                 zfcp_erp_port_boxed(unit->port, 52, (u64)fsf_req);
3344                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
3345                         ZFCP_STATUS_FSFREQ_RETRY;
3346                 break;
3347
3348         case FSF_ADAPTER_STATUS_AVAILABLE:
3349                 switch (fsf_req->qtcb->header.fsf_status_qual.word[0]) {
3350                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
3351                         /* re-establish link to port */
3352                         zfcp_test_link(unit->port);
3353                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3354                         break;
3355                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
3356                         /* ERP strategy will escalate */
3357                         fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3358                         break;
3359                 default:
3360                         ZFCP_LOG_NORMAL
3361                             ("bug: Wrong status qualifier 0x%x arrived.\n",
3362                              fsf_req->qtcb->header.fsf_status_qual.word[0]);
3363                         break;
3364                 }
3365                 break;
3366
3367         case FSF_GOOD:
3368                 ZFCP_LOG_TRACE("unit 0x%016Lx on port 0x%016Lx on adapter %s "
3369                                "closed, port handle 0x%x\n",
3370                                unit->fcp_lun,
3371                                unit->port->wwpn,
3372                                zfcp_get_busid_by_unit(unit),
3373                                unit->handle);
3374                 /* mark unit as closed */
3375                 atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
3376                 retval = 0;
3377                 break;
3378
3379         default:
3380                 ZFCP_LOG_NORMAL("bug: An unknown FSF Status was presented "
3381                                 "(debug info 0x%x)\n",
3382                                 fsf_req->qtcb->header.fsf_status);
3383                 break;
3384         }
3385
3386  skip_fsfstatus:
3387         atomic_clear_mask(ZFCP_STATUS_COMMON_CLOSING, &unit->status);
3388         return retval;
3389 }
3390
3391 /**
3392  * zfcp_fsf_send_fcp_command_task - initiate an FCP command (for a SCSI command)
3393  * @adapter: adapter where scsi command is issued
3394  * @unit: unit where command is sent to
3395  * @scsi_cmnd: scsi command to be sent
3396  * @timer: timer to be started when request is initiated
3397  * @req_flags: flags for fsf_request
3398  */
3399 int
3400 zfcp_fsf_send_fcp_command_task(struct zfcp_adapter *adapter,
3401                                struct zfcp_unit *unit,
3402                                struct scsi_cmnd * scsi_cmnd,
3403                                int use_timer, int req_flags)
3404 {
3405         struct zfcp_fsf_req *fsf_req = NULL;
3406         struct fcp_cmnd_iu *fcp_cmnd_iu;
3407         unsigned int sbtype;
3408         unsigned long lock_flags;
3409         int real_bytes = 0;
3410         int retval = 0;
3411         int mask;
3412
3413         /* setup new FSF request */
3414         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
3415                                      adapter->pool.fsf_req_scsi,
3416                                      &lock_flags, &fsf_req);
3417         if (unlikely(retval < 0)) {
3418                 ZFCP_LOG_DEBUG("error: Could not create FCP command request "
3419                                "for unit 0x%016Lx on port 0x%016Lx on "
3420                                "adapter %s\n",
3421                                unit->fcp_lun,
3422                                unit->port->wwpn,
3423                                zfcp_get_busid_by_adapter(adapter));
3424                 goto failed_req_create;
3425         }
3426
3427         if (unlikely(!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
3428                         &unit->status))) {
3429                 retval = -EBUSY;
3430                 goto unit_blocked;
3431         }
3432
3433         zfcp_unit_get(unit);
3434         fsf_req->unit = unit;
3435
3436         /* associate FSF request with SCSI request (for look up on abort) */
3437         scsi_cmnd->host_scribble = (unsigned char *) fsf_req->req_id;
3438
3439         /* associate SCSI command with FSF request */
3440         fsf_req->data = (unsigned long) scsi_cmnd;
3441
3442         /* set handles of unit and its parent port in QTCB */
3443         fsf_req->qtcb->header.lun_handle = unit->handle;
3444         fsf_req->qtcb->header.port_handle = unit->port->handle;
3445
3446         /* FSF does not define the structure of the FCP_CMND IU */
3447         fcp_cmnd_iu = (struct fcp_cmnd_iu *)
3448             &(fsf_req->qtcb->bottom.io.fcp_cmnd);
3449
3450         /*
3451          * set depending on data direction:
3452          *      data direction bits in SBALE (SB Type)
3453          *      data direction bits in QTCB
3454          *      data direction bits in FCP_CMND IU
3455          */
3456         switch (scsi_cmnd->sc_data_direction) {
3457         case DMA_NONE:
3458                 fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
3459                 /*
3460                  * FIXME(qdio):
3461                  * what is the correct type for commands
3462                  * without 'real' data buffers?
3463                  */
3464                 sbtype = SBAL_FLAGS0_TYPE_READ;
3465                 break;
3466         case DMA_FROM_DEVICE:
3467                 fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_READ;
3468                 sbtype = SBAL_FLAGS0_TYPE_READ;
3469                 fcp_cmnd_iu->rddata = 1;
3470                 break;
3471         case DMA_TO_DEVICE:
3472                 fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_WRITE;
3473                 sbtype = SBAL_FLAGS0_TYPE_WRITE;
3474                 fcp_cmnd_iu->wddata = 1;
3475                 break;
3476         case DMA_BIDIRECTIONAL:
3477         default:
3478                 /*
3479                  * dummy, catch this condition earlier
3480                  * in zfcp_scsi_queuecommand
3481                  */
3482                 goto failed_scsi_cmnd;
3483         }
3484
3485         /* set FC service class in QTCB (3 per default) */
3486         fsf_req->qtcb->bottom.io.service_class = ZFCP_FC_SERVICE_CLASS_DEFAULT;
3487
3488         /* set FCP_LUN in FCP_CMND IU in QTCB */
3489         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
3490
3491         mask = ZFCP_STATUS_UNIT_READONLY | ZFCP_STATUS_UNIT_SHARED;
3492
3493         /* set task attributes in FCP_CMND IU in QTCB */
3494         if (likely((scsi_cmnd->device->simple_tags) ||
3495                    (atomic_test_mask(mask, &unit->status))))
3496                 fcp_cmnd_iu->task_attribute = SIMPLE_Q;
3497         else
3498                 fcp_cmnd_iu->task_attribute = UNTAGGED;
3499
3500         /* set additional length of FCP_CDB in FCP_CMND IU in QTCB, if needed */
3501         if (unlikely(scsi_cmnd->cmd_len > FCP_CDB_LENGTH)) {
3502                 fcp_cmnd_iu->add_fcp_cdb_length
3503                     = (scsi_cmnd->cmd_len - FCP_CDB_LENGTH) >> 2;
3504                 ZFCP_LOG_TRACE("SCSI CDB length is 0x%x, "
3505                                "additional FCP_CDB length is 0x%x "
3506                                "(shifted right 2 bits)\n",
3507                                scsi_cmnd->cmd_len,
3508                                fcp_cmnd_iu->add_fcp_cdb_length);
3509         }
3510         /*
3511          * copy SCSI CDB (including additional length, if any) to
3512          * FCP_CDB in FCP_CMND IU in QTCB
3513          */
3514         memcpy(fcp_cmnd_iu->fcp_cdb, scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
3515
3516         /* FCP CMND IU length in QTCB */
3517         fsf_req->qtcb->bottom.io.fcp_cmnd_length =
3518                 sizeof (struct fcp_cmnd_iu) +
3519                 fcp_cmnd_iu->add_fcp_cdb_length + sizeof (fcp_dl_t);
3520
3521         /* generate SBALEs from data buffer */
3522         real_bytes = zfcp_qdio_sbals_from_scsicmnd(fsf_req, sbtype, scsi_cmnd);
3523         if (unlikely(real_bytes < 0)) {
3524                 if (fsf_req->sbal_number < ZFCP_MAX_SBALS_PER_REQ) {
3525                         ZFCP_LOG_DEBUG(
3526                                 "Data did not fit into available buffer(s), "
3527                                "waiting for more...\n");
3528                         retval = -EIO;
3529                 } else {
3530                         ZFCP_LOG_NORMAL("error: No truncation implemented but "
3531                                         "required. Shutting down unit "
3532                                         "(adapter %s, port 0x%016Lx, "
3533                                         "unit 0x%016Lx)\n",
3534                                         zfcp_get_busid_by_unit(unit),
3535                                         unit->port->wwpn,
3536                                         unit->fcp_lun);
3537                         zfcp_erp_unit_shutdown(unit, 0, 131, (u64)fsf_req);
3538                         retval = -EINVAL;
3539                 }
3540                 goto no_fit;
3541         }
3542
3543         /* set length of FCP data length in FCP_CMND IU in QTCB */
3544         zfcp_set_fcp_dl(fcp_cmnd_iu, real_bytes);
3545
3546         ZFCP_LOG_DEBUG("Sending SCSI command:\n");
3547         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3548                       (char *) scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
3549
3550         if (use_timer)
3551                 zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
3552
3553         retval = zfcp_fsf_req_send(fsf_req);
3554         if (unlikely(retval < 0)) {
3555                 ZFCP_LOG_INFO("error: Could not send FCP command request "
3556                               "on adapter %s, port 0x%016Lx, unit 0x%016Lx\n",
3557                               zfcp_get_busid_by_adapter(adapter),
3558                               unit->port->wwpn,
3559                               unit->fcp_lun);
3560                 goto send_failed;
3561         }
3562
3563         ZFCP_LOG_TRACE("Send FCP Command initiated (adapter %s, "
3564                        "port 0x%016Lx, unit 0x%016Lx)\n",
3565                        zfcp_get_busid_by_adapter(adapter),
3566                        unit->port->wwpn,
3567                        unit->fcp_lun);
3568         goto success;
3569
3570  send_failed:
3571  no_fit:
3572  failed_scsi_cmnd:
3573  unit_blocked:
3574         zfcp_unit_put(unit);
3575         zfcp_fsf_req_free(fsf_req);
3576         fsf_req = NULL;
3577         scsi_cmnd->host_scribble = NULL;
3578  success:
3579  failed_req_create:
3580         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
3581         return retval;
3582 }
3583
3584 struct zfcp_fsf_req *
3585 zfcp_fsf_send_fcp_command_task_management(struct zfcp_adapter *adapter,
3586                                           struct zfcp_unit *unit,
3587                                           u8 tm_flags, int req_flags)
3588 {
3589         struct zfcp_fsf_req *fsf_req = NULL;
3590         int retval = 0;
3591         struct fcp_cmnd_iu *fcp_cmnd_iu;
3592         unsigned long lock_flags;
3593         volatile struct qdio_buffer_element *sbale;
3594
3595         /* setup new FSF request */
3596         retval = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
3597                                      adapter->pool.fsf_req_scsi,
3598                                      &lock_flags, &fsf_req);
3599         if (retval < 0) {
3600                 ZFCP_LOG_INFO("error: Could not create FCP command (task "
3601                               "management) request for adapter %s, port "
3602                               " 0x%016Lx, unit 0x%016Lx.\n",
3603                               zfcp_get_busid_by_adapter(adapter),
3604                               unit->port->wwpn, unit->fcp_lun);
3605                 goto out;
3606         }
3607
3608         if (unlikely(!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
3609                         &unit->status)))
3610                 goto unit_blocked;
3611
3612         /*
3613          * Used to decide on proper handler in the return path,
3614          * could be either zfcp_fsf_send_fcp_command_task_handler or
3615          * zfcp_fsf_send_fcp_command_task_management_handler */
3616
3617         fsf_req->status |= ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT;
3618
3619         /*
3620          * hold a pointer to the unit being target of this
3621          * task management request
3622          */
3623         fsf_req->data = (unsigned long) unit;
3624
3625         /* set FSF related fields in QTCB */
3626         fsf_req->qtcb->header.lun_handle = unit->handle;
3627         fsf_req->qtcb->header.port_handle = unit->port->handle;
3628         fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
3629         fsf_req->qtcb->bottom.io.service_class = ZFCP_FC_SERVICE_CLASS_DEFAULT;
3630         fsf_req->qtcb->bottom.io.fcp_cmnd_length =
3631                 sizeof (struct fcp_cmnd_iu) + sizeof (fcp_dl_t);
3632
3633         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
3634         sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE;
3635         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
3636
3637         /* set FCP related fields in FCP_CMND IU in QTCB */
3638         fcp_cmnd_iu = (struct fcp_cmnd_iu *)
3639                 &(fsf_req->qtcb->bottom.io.fcp_cmnd);
3640         fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
3641         fcp_cmnd_iu->task_management_flags = tm_flags;
3642
3643         zfcp_fsf_start_timer(fsf_req, ZFCP_SCSI_ER_TIMEOUT);
3644         retval = zfcp_fsf_req_send(fsf_req);
3645         if (!retval)
3646                 goto out;
3647
3648  unit_blocked:
3649         zfcp_fsf_req_free(fsf_req);
3650         fsf_req = NULL;
3651
3652  out:
3653         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
3654         return fsf_req;
3655 }
3656
3657 /*
3658  * function:    zfcp_fsf_send_fcp_command_handler
3659  *
3660  * purpose:     is called for finished Send FCP Command
3661  *
3662  * returns:
3663  */
3664 static int
3665 zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *fsf_req)
3666 {
3667         int retval = -EINVAL;
3668         struct zfcp_unit *unit;
3669         struct fsf_qtcb_header *header;
3670         u16 subtable, rule, counter;
3671
3672         header = &fsf_req->qtcb->header;
3673
3674         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT))
3675                 unit = (struct zfcp_unit *) fsf_req->data;
3676         else
3677                 unit = fsf_req->unit;
3678
3679         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
3680                 /* go directly to calls of special handlers */
3681                 goto skip_fsfstatus;
3682         }
3683
3684         /* evaluate FSF status in QTCB */
3685         switch (header->fsf_status) {
3686
3687         case FSF_PORT_HANDLE_NOT_VALID:
3688                 ZFCP_LOG_INFO("Temporary port identifier 0x%x for port "
3689                               "0x%016Lx on adapter %s invalid\n",
3690                               unit->port->handle,
3691                               unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3692                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3693                               (char *) &header->fsf_status_qual,
3694                               sizeof (union fsf_status_qual));
3695                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 112,
3696                                         (u64)fsf_req);
3697                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3698                 break;
3699
3700         case FSF_LUN_HANDLE_NOT_VALID:
3701                 ZFCP_LOG_INFO("Temporary LUN identifier 0x%x for unit "
3702                               "0x%016Lx on port 0x%016Lx on adapter %s is "
3703                               "invalid. This may happen occasionally.\n",
3704                               unit->handle,
3705                               unit->fcp_lun,
3706                               unit->port->wwpn,
3707                               zfcp_get_busid_by_unit(unit));
3708                 ZFCP_LOG_NORMAL("Status qualifier data:\n");
3709                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
3710                               (char *) &header->fsf_status_qual,
3711                               sizeof (union fsf_status_qual));
3712                 zfcp_erp_port_reopen(unit->port, 0, 113, (u64)fsf_req);
3713                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3714                 break;
3715
3716         case FSF_HANDLE_MISMATCH:
3717                 ZFCP_LOG_NORMAL("bug: The port handle 0x%x has changed "
3718                                 "unexpectedly. (adapter %s, port 0x%016Lx, "
3719                                 "unit 0x%016Lx)\n",
3720                                 unit->port->handle,
3721                                 zfcp_get_busid_by_unit(unit),
3722                                 unit->port->wwpn,
3723                                 unit->fcp_lun);
3724                 ZFCP_LOG_NORMAL("status qualifier:\n");
3725                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
3726                               (char *) &header->fsf_status_qual,
3727                               sizeof (union fsf_status_qual));
3728                 zfcp_erp_adapter_reopen(unit->port->adapter, 0, 114,
3729                                         (u64)fsf_req);
3730                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3731                 break;
3732
3733         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
3734                 ZFCP_LOG_INFO("error: adapter %s does not support fc "
3735                               "class %d.\n",
3736                               zfcp_get_busid_by_unit(unit),
3737                               ZFCP_FC_SERVICE_CLASS_DEFAULT);
3738                 /* stop operation for this adapter */
3739                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, 132,
3740                                           (u64)fsf_req);
3741                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3742                 break;
3743
3744         case FSF_FCPLUN_NOT_VALID:
3745                 ZFCP_LOG_NORMAL("bug: unit 0x%016Lx on port 0x%016Lx on "
3746                                 "adapter %s does not have correct unit "
3747                                 "handle 0x%x\n",
3748                                 unit->fcp_lun,
3749                                 unit->port->wwpn,
3750                                 zfcp_get_busid_by_unit(unit),
3751                                 unit->handle);
3752                 ZFCP_LOG_DEBUG("status qualifier:\n");
3753                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3754                               (char *) &header->fsf_status_qual,
3755                               sizeof (union fsf_status_qual));
3756                 zfcp_erp_port_reopen(unit->port, 0, 115, (u64)fsf_req);
3757                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3758                 break;
3759
3760         case FSF_ACCESS_DENIED:
3761                 ZFCP_LOG_NORMAL("Access denied, cannot send FCP command to "
3762                                 "unit 0x%016Lx on port 0x%016Lx on "
3763                                 "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
3764                                 zfcp_get_busid_by_unit(unit));
3765                 for (counter = 0; counter < 2; counter++) {
3766                         subtable = header->fsf_status_qual.halfword[counter * 2];
3767                         rule = header->fsf_status_qual.halfword[counter * 2 + 1];
3768                         switch (subtable) {
3769                         case FSF_SQ_CFDC_SUBTABLE_OS:
3770                         case FSF_SQ_CFDC_SUBTABLE_PORT_WWPN:
3771                         case FSF_SQ_CFDC_SUBTABLE_PORT_DID:
3772                         case FSF_SQ_CFDC_SUBTABLE_LUN:
3773                                 ZFCP_LOG_INFO("Access denied (%s rule %d)\n",
3774                                         zfcp_act_subtable_type[subtable], rule);
3775                                 break;
3776                         }
3777                 }
3778                 zfcp_erp_unit_access_denied(unit, 61, (u64)fsf_req);
3779                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3780                 break;
3781
3782         case FSF_DIRECTION_INDICATOR_NOT_VALID:
3783                 ZFCP_LOG_INFO("bug: Invalid data direction given for unit "
3784                               "0x%016Lx on port 0x%016Lx on adapter %s "
3785                               "(debug info %d)\n",
3786                               unit->fcp_lun,
3787                               unit->port->wwpn,
3788                               zfcp_get_busid_by_unit(unit),
3789                               fsf_req->qtcb->bottom.io.data_direction);
3790                 /* stop operation for this adapter */
3791                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, 133,
3792                                           (u64)fsf_req);
3793                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3794                 break;
3795
3796         case FSF_CMND_LENGTH_NOT_VALID:
3797                 ZFCP_LOG_NORMAL
3798                     ("bug: An invalid control-data-block length field "
3799                      "was found in a command for unit 0x%016Lx on port "
3800                      "0x%016Lx on adapter %s " "(debug info %d)\n",
3801                      unit->fcp_lun, unit->port->wwpn,
3802                      zfcp_get_busid_by_unit(unit),
3803                      fsf_req->qtcb->bottom.io.fcp_cmnd_length);
3804                 /* stop operation for this adapter */
3805                 zfcp_erp_adapter_shutdown(unit->port->adapter, 0, 134,
3806                                           (u64)fsf_req);
3807                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3808                 break;
3809
3810         case FSF_PORT_BOXED:
3811                 ZFCP_LOG_DEBUG("The remote port 0x%016Lx on adapter %s "
3812                                "needs to be reopened\n",
3813                                unit->port->wwpn, zfcp_get_busid_by_unit(unit));
3814                 zfcp_erp_port_boxed(unit->port, 53, (u64)fsf_req);
3815                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
3816                         ZFCP_STATUS_FSFREQ_RETRY;
3817                 break;
3818
3819         case FSF_LUN_BOXED:
3820                 ZFCP_LOG_NORMAL("unit needs to be reopened (adapter %s, "
3821                                 "wwpn=0x%016Lx, fcp_lun=0x%016Lx)\n",
3822                                 zfcp_get_busid_by_unit(unit),
3823                                 unit->port->wwpn, unit->fcp_lun);
3824                 zfcp_erp_unit_boxed(unit, 54, (u64)fsf_req);
3825                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
3826                         | ZFCP_STATUS_FSFREQ_RETRY;
3827                 break;
3828
3829         case FSF_ADAPTER_STATUS_AVAILABLE:
3830                 switch (header->fsf_status_qual.word[0]) {
3831                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
3832                         /* re-establish link to port */
3833                         zfcp_test_link(unit->port);
3834                         break;
3835                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
3836                         /* FIXME(hw) need proper specs for proper action */
3837                         /* let scsi stack deal with retries and escalation */
3838                         break;
3839                 default:
3840                         ZFCP_LOG_NORMAL
3841                             ("Unknown status qualifier 0x%x arrived.\n",
3842                              header->fsf_status_qual.word[0]);
3843                         break;
3844                 }
3845                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
3846                 break;
3847
3848         case FSF_GOOD:
3849                 break;
3850
3851         case FSF_FCP_RSP_AVAILABLE:
3852                 break;
3853         }
3854
3855  skip_fsfstatus:
3856         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT) {
3857                 retval =
3858                     zfcp_fsf_send_fcp_command_task_management_handler(fsf_req);
3859         } else {
3860                 retval = zfcp_fsf_send_fcp_command_task_handler(fsf_req);
3861                 fsf_req->unit = NULL;
3862                 zfcp_unit_put(unit);
3863         }
3864         return retval;
3865 }
3866
3867 /*
3868  * function:    zfcp_fsf_send_fcp_command_task_handler
3869  *
3870  * purpose:     evaluates FCP_RSP IU
3871  *
3872  * returns:
3873  */
3874 static int
3875 zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *fsf_req)
3876 {
3877         int retval = 0;
3878         struct scsi_cmnd *scpnt;
3879         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
3880             &(fsf_req->qtcb->bottom.io.fcp_rsp);
3881         struct fcp_cmnd_iu *fcp_cmnd_iu = (struct fcp_cmnd_iu *)
3882             &(fsf_req->qtcb->bottom.io.fcp_cmnd);
3883         u32 sns_len;
3884         char *fcp_rsp_info = zfcp_get_fcp_rsp_info_ptr(fcp_rsp_iu);
3885         unsigned long flags;
3886         struct zfcp_unit *unit = fsf_req->unit;
3887
3888         read_lock_irqsave(&fsf_req->adapter->abort_lock, flags);
3889         scpnt = (struct scsi_cmnd *) fsf_req->data;
3890         if (unlikely(!scpnt)) {
3891                 ZFCP_LOG_DEBUG
3892                     ("Command with fsf_req %p is not associated to "
3893                      "a scsi command anymore. Aborted?\n", fsf_req);
3894                 goto out;
3895         }
3896         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTED)) {
3897                 /* FIXME: (design) mid-layer should handle DID_ABORT like
3898                  *        DID_SOFT_ERROR by retrying the request for devices
3899                  *        that allow retries.
3900                  */
3901                 ZFCP_LOG_DEBUG("Setting DID_SOFT_ERROR and SUGGEST_RETRY\n");
3902                 set_host_byte(&scpnt->result, DID_SOFT_ERROR);
3903                 set_driver_byte(&scpnt->result, SUGGEST_RETRY);
3904                 goto skip_fsfstatus;
3905         }
3906
3907         if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
3908                 ZFCP_LOG_DEBUG("Setting DID_ERROR\n");
3909                 set_host_byte(&scpnt->result, DID_ERROR);
3910                 goto skip_fsfstatus;
3911         }
3912
3913         /* set message byte of result in SCSI command */
3914         scpnt->result |= COMMAND_COMPLETE << 8;
3915
3916         /*
3917          * copy SCSI status code of FCP_STATUS of FCP_RSP IU to status byte
3918          * of result in SCSI command
3919          */
3920         scpnt->result |= fcp_rsp_iu->scsi_status;
3921         if (unlikely(fcp_rsp_iu->scsi_status)) {
3922                 /* DEBUG */
3923                 ZFCP_LOG_DEBUG("status for SCSI Command:\n");
3924                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3925                               scpnt->cmnd, scpnt->cmd_len);
3926                 ZFCP_LOG_DEBUG("SCSI status code 0x%x\n",
3927                                 fcp_rsp_iu->scsi_status);
3928                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3929                               (void *) fcp_rsp_iu, sizeof (struct fcp_rsp_iu));
3930                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3931                               zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu),
3932                               fcp_rsp_iu->fcp_sns_len);
3933         }
3934
3935         /* check FCP_RSP_INFO */
3936         if (unlikely(fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)) {
3937                 ZFCP_LOG_DEBUG("rsp_len is valid\n");
3938                 switch (fcp_rsp_info[3]) {
3939                 case RSP_CODE_GOOD:
3940                         /* ok, continue */
3941                         ZFCP_LOG_TRACE("no failure or Task Management "
3942                                        "Function complete\n");
3943                         set_host_byte(&scpnt->result, DID_OK);
3944                         break;
3945                 case RSP_CODE_LENGTH_MISMATCH:
3946                         /* hardware bug */
3947                         ZFCP_LOG_NORMAL("bug: FCP response code indictates "
3948                                         "that the fibrechannel protocol data "
3949                                         "length differs from the burst length. "
3950                                         "The problem occured on unit 0x%016Lx "
3951                                         "on port 0x%016Lx on adapter %s",
3952                                         unit->fcp_lun,
3953                                         unit->port->wwpn,
3954                                         zfcp_get_busid_by_unit(unit));
3955                         /* dump SCSI CDB as prepared by zfcp */
3956                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3957                                       (char *) &fsf_req->qtcb->
3958                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
3959                         set_host_byte(&scpnt->result, DID_ERROR);
3960                         goto skip_fsfstatus;
3961                 case RSP_CODE_FIELD_INVALID:
3962                         /* driver or hardware bug */
3963                         ZFCP_LOG_NORMAL("bug: FCP response code indictates "
3964                                         "that the fibrechannel protocol data "
3965                                         "fields were incorrectly set up. "
3966                                         "The problem occured on the unit "
3967                                         "0x%016Lx on port 0x%016Lx on "
3968                                         "adapter %s",
3969                                         unit->fcp_lun,
3970                                         unit->port->wwpn,
3971                                         zfcp_get_busid_by_unit(unit));
3972                         /* dump SCSI CDB as prepared by zfcp */
3973                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3974                                       (char *) &fsf_req->qtcb->
3975                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
3976                         set_host_byte(&scpnt->result, DID_ERROR);
3977                         goto skip_fsfstatus;
3978                 case RSP_CODE_RO_MISMATCH:
3979                         /* hardware bug */
3980                         ZFCP_LOG_NORMAL("bug: The FCP response code indicates "
3981                                         "that conflicting  values for the "
3982                                         "fibrechannel payload offset from the "
3983                                         "header were found. "
3984                                         "The problem occured on unit 0x%016Lx "
3985                                         "on port 0x%016Lx on adapter %s.\n",
3986                                         unit->fcp_lun,
3987                                         unit->port->wwpn,
3988                                         zfcp_get_busid_by_unit(unit));
3989                         /* dump SCSI CDB as prepared by zfcp */
3990                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
3991                                       (char *) &fsf_req->qtcb->
3992                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
3993                         set_host_byte(&scpnt->result, DID_ERROR);
3994                         goto skip_fsfstatus;
3995                 default:
3996                         ZFCP_LOG_NORMAL("bug: An invalid FCP response "
3997                                         "code was detected for a command. "
3998                                         "The problem occured on the unit "
3999                                         "0x%016Lx on port 0x%016Lx on "
4000                                         "adapter %s (debug info 0x%x)\n",
4001                                         unit->fcp_lun,
4002                                         unit->port->wwpn,
4003                                         zfcp_get_busid_by_unit(unit),
4004                                         fcp_rsp_info[3]);
4005                         /* dump SCSI CDB as prepared by zfcp */
4006                         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
4007                                       (char *) &fsf_req->qtcb->
4008                                       bottom.io.fcp_cmnd, FSF_FCP_CMND_SIZE);
4009                         set_host_byte(&scpnt->result, DID_ERROR);
4010                         goto skip_fsfstatus;
4011                 }
4012         }
4013
4014         /* check for sense data */
4015         if (unlikely(fcp_rsp_iu->validity.bits.fcp_sns_len_valid)) {
4016                 sns_len = FSF_FCP_RSP_SIZE -
4017                     sizeof (struct fcp_rsp_iu) + fcp_rsp_iu->fcp_rsp_len;
4018                 ZFCP_LOG_TRACE("room for %i bytes sense data in QTCB\n",
4019                                sns_len);
4020                 sns_len = min(sns_len, (u32) SCSI_SENSE_BUFFERSIZE);
4021                 ZFCP_LOG_TRACE("room for %i bytes sense data in SCSI command\n",
4022                                SCSI_SENSE_BUFFERSIZE);
4023                 sns_len = min(sns_len, fcp_rsp_iu->fcp_sns_len);
4024                 ZFCP_LOG_TRACE("scpnt->result =0x%x, command was:\n",
4025                                scpnt->result);
4026                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE,
4027                               (void *) &scpnt->cmnd, scpnt->cmd_len);
4028
4029                 ZFCP_LOG_TRACE("%i bytes sense data provided by FCP\n",
4030                                fcp_rsp_iu->fcp_sns_len);
4031                 memcpy(scpnt->sense_buffer,
4032                        zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu), sns_len);
4033                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE,
4034                               (void *)scpnt->sense_buffer, sns_len);
4035         }
4036
4037         /* check for overrun */
4038         if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_over)) {
4039                 ZFCP_LOG_INFO("A data overrun was detected for a command. "
4040                               "unit 0x%016Lx, port 0x%016Lx, adapter %s. "
4041                               "The response data length is "
4042                               "%d, the original length was %d.\n",
4043                               unit->fcp_lun,
4044                               unit->port->wwpn,
4045                               zfcp_get_busid_by_unit(unit),
4046                               fcp_rsp_iu->fcp_resid,
4047                               (int) zfcp_get_fcp_dl(fcp_cmnd_iu));
4048         }
4049
4050         /* check for underrun */
4051         if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_under)) {
4052                 ZFCP_LOG_INFO("A data underrun was detected for a command. "
4053                               "unit 0x%016Lx, port 0x%016Lx, adapter %s. "
4054                               "The response data length is "
4055                               "%d, the original length was %d.\n",
4056                               unit->fcp_lun,
4057                               unit->port->wwpn,
4058                               zfcp_get_busid_by_unit(unit),
4059                               fcp_rsp_iu->fcp_resid,
4060                               (int) zfcp_get_fcp_dl(fcp_cmnd_iu));
4061
4062                 scsi_set_resid(scpnt, fcp_rsp_iu->fcp_resid);
4063                 if (scsi_bufflen(scpnt) - scsi_get_resid(scpnt) <
4064                     scpnt->underflow)
4065                         set_host_byte(&scpnt->result, DID_ERROR);
4066         }
4067
4068  skip_fsfstatus:
4069         ZFCP_LOG_DEBUG("scpnt->result =0x%x\n", scpnt->result);
4070
4071         if (scpnt->result != 0)
4072                 zfcp_scsi_dbf_event_result("erro", 3, fsf_req->adapter, scpnt, fsf_req);
4073         else if (scpnt->retries > 0)
4074                 zfcp_scsi_dbf_event_result("retr", 4, fsf_req->adapter, scpnt, fsf_req);
4075         else
4076                 zfcp_scsi_dbf_event_result("norm", 6, fsf_req->adapter, scpnt, fsf_req);
4077
4078         /* cleanup pointer (need this especially for abort) */
4079         scpnt->host_scribble = NULL;
4080
4081         /* always call back */
4082         (scpnt->scsi_done) (scpnt);
4083
4084         /*
4085          * We must hold this lock until scsi_done has been called.
4086          * Otherwise we may call scsi_done after abort regarding this
4087          * command has completed.
4088          * Note: scsi_done must not block!
4089          */
4090  out:
4091         read_unlock_irqrestore(&fsf_req->adapter->abort_lock, flags);
4092         return retval;
4093 }
4094
4095 /*
4096  * function:    zfcp_fsf_send_fcp_command_task_management_handler
4097  *
4098  * purpose:     evaluates FCP_RSP IU
4099  *
4100  * returns:
4101  */
4102 static int
4103 zfcp_fsf_send_fcp_command_task_management_handler(struct zfcp_fsf_req *fsf_req)
4104 {
4105         int retval = 0;
4106         struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
4107             &(fsf_req->qtcb->bottom.io.fcp_rsp);
4108         char *fcp_rsp_info = zfcp_get_fcp_rsp_info_ptr(fcp_rsp_iu);
4109         struct zfcp_unit *unit = (struct zfcp_unit *) fsf_req->data;
4110
4111         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
4112                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
4113                 goto skip_fsfstatus;
4114         }
4115
4116         /* check FCP_RSP_INFO */
4117         switch (fcp_rsp_info[3]) {
4118         case RSP_CODE_GOOD:
4119                 /* ok, continue */
4120                 ZFCP_LOG_DEBUG("no failure or Task Management "
4121                                "Function complete\n");
4122                 break;
4123         case RSP_CODE_TASKMAN_UNSUPP:
4124                 ZFCP_LOG_NORMAL("bug: A reuested task management function "
4125                                 "is not supported on the target device "
4126                                 "unit 0x%016Lx, port 0x%016Lx, adapter %s\n ",
4127                                 unit->fcp_lun,
4128                                 unit->port->wwpn,
4129                                 zfcp_get_busid_by_unit(unit));
4130                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP;
4131                 break;
4132         case RSP_CODE_TASKMAN_FAILED:
4133                 ZFCP_LOG_NORMAL("bug: A reuested task management function "
4134                                 "failed to complete successfully. "
4135                                 "unit 0x%016Lx, port 0x%016Lx, adapter %s.\n",
4136                                 unit->fcp_lun,
4137                                 unit->port->wwpn,
4138                                 zfcp_get_busid_by_unit(unit));
4139                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
4140                 break;
4141         default:
4142                 ZFCP_LOG_NORMAL("bug: An invalid FCP response "
4143                                 "code was detected for a command. "
4144                                 "unit 0x%016Lx, port 0x%016Lx, adapter %s "
4145                                 "(debug info 0x%x)\n",
4146                                 unit->fcp_lun,
4147                                 unit->port->wwpn,
4148                                 zfcp_get_busid_by_unit(unit),
4149                                 fcp_rsp_info[3]);
4150                 fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
4151         }
4152
4153       skip_fsfstatus:
4154         return retval;
4155 }
4156
4157
4158 /*
4159  * function:    zfcp_fsf_control_file
4160  *
4161  * purpose:     Initiator of the control file upload/download FSF requests
4162  *
4163  * returns:     0           - FSF request is successfuly created and queued
4164  *              -EOPNOTSUPP - The FCP adapter does not have Control File support
4165  *              -EINVAL     - Invalid direction specified
4166  *              -ENOMEM     - Insufficient memory
4167  *              -EPERM      - Cannot create FSF request or place it in QDIO queue
4168  */
4169 int
4170 zfcp_fsf_control_file(struct zfcp_adapter *adapter,
4171                       struct zfcp_fsf_req **fsf_req_ptr,
4172                       u32 fsf_command,
4173                       u32 option,
4174                       struct zfcp_sg_list *sg_list)
4175 {
4176         struct zfcp_fsf_req *fsf_req;
4177         struct fsf_qtcb_bottom_support *bottom;
4178         volatile struct qdio_buffer_element *sbale;
4179         unsigned long lock_flags;
4180         int req_flags = 0;
4181         int direction;
4182         int retval = 0;
4183
4184         if (!(adapter->adapter_features & FSF_FEATURE_CFDC)) {
4185                 ZFCP_LOG_INFO("cfdc not supported (adapter %s)\n",
4186                               zfcp_get_busid_by_adapter(adapter));
4187                 retval = -EOPNOTSUPP;
4188                 goto out;
4189         }
4190
4191         switch (fsf_command) {
4192
4193         case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
4194                 direction = SBAL_FLAGS0_TYPE_WRITE;
4195                 if ((option != FSF_CFDC_OPTION_FULL_ACCESS) &&
4196                     (option != FSF_CFDC_OPTION_RESTRICTED_ACCESS))
4197                         req_flags = ZFCP_WAIT_FOR_SBAL;
4198                 break;
4199
4200         case FSF_QTCB_UPLOAD_CONTROL_FILE:
4201                 direction = SBAL_FLAGS0_TYPE_READ;
4202                 break;
4203
4204         default:
4205                 ZFCP_LOG_INFO("Invalid FSF command code 0x%08x\n", fsf_command);
4206                 retval = -EINVAL;
4207                 goto out;
4208         }
4209
4210         retval = zfcp_fsf_req_create(adapter, fsf_command, req_flags,
4211                                      NULL, &lock_flags, &fsf_req);
4212         if (retval < 0) {
4213                 ZFCP_LOG_INFO("error: Could not create FSF request for the "
4214                               "adapter %s\n",
4215                         zfcp_get_busid_by_adapter(adapter));
4216                 retval = -EPERM;
4217                 goto unlock_queue_lock;
4218         }
4219
4220         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
4221         sbale[0].flags |= direction;
4222
4223         bottom = &fsf_req->qtcb->bottom.support;
4224         bottom->operation_subtype = FSF_CFDC_OPERATION_SUBTYPE;
4225         bottom->option = option;
4226
4227         if (sg_list->count > 0) {
4228                 int bytes;
4229
4230                 bytes = zfcp_qdio_sbals_from_sg(fsf_req, direction,
4231                                                 sg_list->sg, sg_list->count,
4232                                                 ZFCP_MAX_SBALS_PER_REQ);
4233                 if (bytes != ZFCP_CFDC_MAX_CONTROL_FILE_SIZE) {
4234                         ZFCP_LOG_INFO(
4235                                 "error: Could not create sufficient number of "
4236                                 "SBALS for an FSF request to the adapter %s\n",
4237                                 zfcp_get_busid_by_adapter(adapter));
4238                         retval = -ENOMEM;
4239                         goto free_fsf_req;
4240                 }
4241         } else
4242                 sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
4243
4244         zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
4245         retval = zfcp_fsf_req_send(fsf_req);
4246         if (retval < 0) {
4247                 ZFCP_LOG_INFO("initiation of cfdc up/download failed"
4248                               "(adapter %s)\n",
4249                               zfcp_get_busid_by_adapter(adapter));
4250                 retval = -EPERM;
4251                 goto free_fsf_req;
4252         }
4253         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
4254
4255         ZFCP_LOG_NORMAL("Control file %s FSF request has been sent to the "
4256                         "adapter %s\n",
4257                         fsf_command == FSF_QTCB_DOWNLOAD_CONTROL_FILE ?
4258                         "download" : "upload",
4259                         zfcp_get_busid_by_adapter(adapter));
4260
4261         wait_event(fsf_req->completion_wq,
4262                    fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
4263
4264         *fsf_req_ptr = fsf_req;
4265         goto out;
4266
4267  free_fsf_req:
4268         zfcp_fsf_req_free(fsf_req);
4269  unlock_queue_lock:
4270         write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
4271  out:
4272         return retval;
4273 }
4274
4275
4276 /*
4277  * function:    zfcp_fsf_control_file_handler
4278  *
4279  * purpose:     Handler of the control file upload/download FSF requests
4280  *
4281  * returns:     0       - FSF request successfuly processed
4282  *              -EAGAIN - Operation has to be repeated because of a temporary problem
4283  *              -EACCES - There is no permission to execute an operation
4284  *              -EPERM  - The control file is not in a right format
4285  *              -EIO    - There is a problem with the FCP adapter
4286  *              -EINVAL - Invalid operation
4287  *              -EFAULT - User space memory I/O operation fault
4288  */
4289 static int
4290 zfcp_fsf_control_file_handler(struct zfcp_fsf_req *fsf_req)
4291 {
4292         struct zfcp_adapter *adapter = fsf_req->adapter;
4293         struct fsf_qtcb_header *header = &fsf_req->qtcb->header;
4294         struct fsf_qtcb_bottom_support *bottom = &fsf_req->qtcb->bottom.support;
4295         int retval = 0;
4296
4297         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
4298                 retval = -EINVAL;
4299                 goto skip_fsfstatus;
4300         }
4301
4302         switch (header->fsf_status) {
4303
4304         case FSF_GOOD:
4305                 ZFCP_LOG_NORMAL(
4306                         "The FSF request has been successfully completed "
4307                         "on the adapter %s\n",
4308                         zfcp_get_busid_by_adapter(adapter));
4309                 break;
4310
4311         case FSF_OPERATION_PARTIALLY_SUCCESSFUL:
4312                 if (bottom->operation_subtype == FSF_CFDC_OPERATION_SUBTYPE) {
4313                         switch (header->fsf_status_qual.word[0]) {
4314
4315                         case FSF_SQ_CFDC_HARDENED_ON_SE:
4316                                 ZFCP_LOG_NORMAL(
4317                                         "CFDC on the adapter %s has being "
4318                                         "hardened on primary and secondary SE\n",
4319                                         zfcp_get_busid_by_adapter(adapter));
4320                                 break;
4321
4322                         case FSF_SQ_CFDC_COULD_NOT_HARDEN_ON_SE:
4323                                 ZFCP_LOG_NORMAL(
4324                                         "CFDC of the adapter %s could not "
4325                                         "be saved on the SE\n",
4326                                         zfcp_get_busid_by_adapter(adapter));
4327                                 break;
4328
4329                         case FSF_SQ_CFDC_COULD_NOT_HARDEN_ON_SE2:
4330                                 ZFCP_LOG_NORMAL(
4331                                         "CFDC of the adapter %s could not "
4332                                         "be copied to the secondary SE\n",
4333                                         zfcp_get_busid_by_adapter(adapter));
4334                                 break;
4335
4336                         default:
4337                                 ZFCP_LOG_NORMAL(
4338                                         "CFDC could not be hardened "
4339                                         "on the adapter %s\n",
4340                                         zfcp_get_busid_by_adapter(adapter));
4341                         }
4342                 }
4343                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4344                 retval = -EAGAIN;
4345                 break;
4346
4347         case FSF_AUTHORIZATION_FAILURE:
4348                 ZFCP_LOG_NORMAL(
4349                         "Adapter %s does not accept privileged commands\n",
4350                         zfcp_get_busid_by_adapter(adapter));
4351                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4352                 retval = -EACCES;
4353                 break;
4354
4355         case FSF_CFDC_ERROR_DETECTED:
4356                 ZFCP_LOG_NORMAL(
4357                         "Error at position %d in the CFDC, "
4358                         "CFDC is discarded by the adapter %s\n",
4359                         header->fsf_status_qual.word[0],
4360                         zfcp_get_busid_by_adapter(adapter));
4361                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4362                 retval = -EPERM;
4363                 break;
4364
4365         case FSF_CONTROL_FILE_UPDATE_ERROR:
4366                 ZFCP_LOG_NORMAL(
4367                         "Adapter %s cannot harden the control file, "
4368                         "file is discarded\n",
4369                         zfcp_get_busid_by_adapter(adapter));
4370                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4371                 retval = -EIO;
4372                 break;
4373
4374         case FSF_CONTROL_FILE_TOO_LARGE:
4375                 ZFCP_LOG_NORMAL(
4376                         "Control file is too large, file is discarded "
4377                         "by the adapter %s\n",
4378                         zfcp_get_busid_by_adapter(adapter));
4379                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4380                 retval = -EIO;
4381                 break;
4382
4383         case FSF_ACCESS_CONFLICT_DETECTED:
4384                 if (bottom->operation_subtype == FSF_CFDC_OPERATION_SUBTYPE)
4385                         ZFCP_LOG_NORMAL(
4386                                 "CFDC has been discarded by the adapter %s, "
4387                                 "because activation would impact "
4388                                 "%d active connection(s)\n",
4389                                 zfcp_get_busid_by_adapter(adapter),
4390                                 header->fsf_status_qual.word[0]);
4391                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4392                 retval = -EIO;
4393                 break;
4394
4395         case FSF_CONFLICTS_OVERRULED:
4396                 if (bottom->operation_subtype == FSF_CFDC_OPERATION_SUBTYPE)
4397                         ZFCP_LOG_NORMAL(
4398                                 "CFDC has been activated on the adapter %s, "
4399                                 "but activation has impacted "
4400                                 "%d active connection(s)\n",
4401                                 zfcp_get_busid_by_adapter(adapter),
4402                                 header->fsf_status_qual.word[0]);
4403                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4404                 retval = -EIO;
4405                 break;
4406
4407         case FSF_UNKNOWN_OP_SUBTYPE:
4408                 ZFCP_LOG_NORMAL("unknown operation subtype (adapter: %s, "
4409                                 "op_subtype=0x%x)\n",
4410                                 zfcp_get_busid_by_adapter(adapter),
4411                                 bottom->operation_subtype);
4412                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4413                 retval = -EINVAL;
4414                 break;
4415
4416         case FSF_INVALID_COMMAND_OPTION:
4417                 ZFCP_LOG_NORMAL(
4418                         "Invalid option 0x%x has been specified "
4419                         "in QTCB bottom sent to the adapter %s\n",
4420                         bottom->option,
4421                         zfcp_get_busid_by_adapter(adapter));
4422                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4423                 retval = -EINVAL;
4424                 break;
4425
4426         default:
4427                 ZFCP_LOG_NORMAL(
4428                         "bug: An unknown/unexpected FSF status 0x%08x "
4429                         "was presented on the adapter %s\n",
4430                         header->fsf_status,
4431                         zfcp_get_busid_by_adapter(adapter));
4432                 fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
4433                 retval = -EINVAL;
4434                 break;
4435         }
4436
4437 skip_fsfstatus:
4438         return retval;
4439 }
4440
4441 static inline int
4442 zfcp_fsf_req_sbal_check(unsigned long *flags,
4443                         struct zfcp_qdio_queue *queue, int needed)
4444 {
4445         write_lock_irqsave(&queue->queue_lock, *flags);
4446         if (likely(atomic_read(&queue->free_count) >= needed))
4447                 return 1;
4448         write_unlock_irqrestore(&queue->queue_lock, *flags);
4449         return 0;
4450 }
4451
4452 /*
4453  * set qtcb pointer in fsf_req and initialize QTCB
4454  */
4455 static void
4456 zfcp_fsf_req_qtcb_init(struct zfcp_fsf_req *fsf_req)
4457 {
4458         if (likely(fsf_req->qtcb != NULL)) {
4459                 fsf_req->qtcb->prefix.req_seq_no =
4460                         fsf_req->adapter->fsf_req_seq_no;
4461                 fsf_req->qtcb->prefix.req_id = fsf_req->req_id;
4462                 fsf_req->qtcb->prefix.ulp_info = ZFCP_ULP_INFO_VERSION;
4463                 fsf_req->qtcb->prefix.qtcb_type =
4464                         fsf_qtcb_type[fsf_req->fsf_command];
4465                 fsf_req->qtcb->prefix.qtcb_version = ZFCP_QTCB_VERSION;
4466                 fsf_req->qtcb->header.req_handle = fsf_req->req_id;
4467                 fsf_req->qtcb->header.fsf_command = fsf_req->fsf_command;
4468         }
4469 }
4470
4471 /**
4472  * zfcp_fsf_req_sbal_get - try to get one SBAL in the request queue
4473  * @adapter: adapter for which request queue is examined
4474  * @req_flags: flags indicating whether to wait for needed SBAL or not
4475  * @lock_flags: lock_flags if queue_lock is taken
4476  * Return: 0 on success, otherwise -EIO, or -ERESTARTSYS
4477  * Locks: lock adapter->request_queue->queue_lock on success
4478  */
4479 static int
4480 zfcp_fsf_req_sbal_get(struct zfcp_adapter *adapter, int req_flags,
4481                       unsigned long *lock_flags)
4482 {
4483         long ret;
4484         struct zfcp_qdio_queue *req_queue = &adapter->request_queue;
4485
4486         if (unlikely(req_flags & ZFCP_WAIT_FOR_SBAL)) {
4487                 ret = wait_event_interruptible_timeout(adapter->request_wq,
4488                         zfcp_fsf_req_sbal_check(lock_flags, req_queue, 1),
4489                                                        ZFCP_SBAL_TIMEOUT);
4490                 if (ret < 0)
4491                         return ret;
4492                 if (!ret)
4493                         return -EIO;
4494         } else if (!zfcp_fsf_req_sbal_check(lock_flags, req_queue, 1))
4495                 return -EIO;
4496
4497         return 0;
4498 }
4499
4500 /*
4501  * function:    zfcp_fsf_req_create
4502  *
4503  * purpose:     create an FSF request at the specified adapter and
4504  *              setup common fields
4505  *
4506  * returns:     -ENOMEM if there was insufficient memory for a request
4507  *              -EIO if no qdio buffers could be allocate to the request
4508  *              -EINVAL/-EPERM on bug conditions in req_dequeue
4509  *              0 in success
4510  *
4511  * note:        The created request is returned by reference.
4512  *
4513  * locks:       lock of concerned request queue must not be held,
4514  *              but is held on completion (write, irqsave)
4515  */
4516 int
4517 zfcp_fsf_req_create(struct zfcp_adapter *adapter, u32 fsf_cmd, int req_flags,
4518                     mempool_t *pool, unsigned long *lock_flags,
4519                     struct zfcp_fsf_req **fsf_req_p)
4520 {
4521         volatile struct qdio_buffer_element *sbale;
4522         struct zfcp_fsf_req *fsf_req = NULL;
4523         int ret = 0;
4524         struct zfcp_qdio_queue *req_queue = &adapter->request_queue;
4525
4526         /* allocate new FSF request */
4527         fsf_req = zfcp_fsf_req_alloc(pool, req_flags);
4528         if (unlikely(NULL == fsf_req)) {
4529                 ZFCP_LOG_DEBUG("error: Could not put an FSF request into "
4530                                "the outbound (send) queue.\n");
4531                 ret = -ENOMEM;
4532                 goto failed_fsf_req;
4533         }
4534
4535         fsf_req->adapter = adapter;
4536         fsf_req->fsf_command = fsf_cmd;
4537         INIT_LIST_HEAD(&fsf_req->list);
4538         init_timer(&fsf_req->timer);
4539
4540         /* initialize waitqueue which may be used to wait on
4541            this request completion */
4542         init_waitqueue_head(&fsf_req->completion_wq);
4543
4544         ret = zfcp_fsf_req_sbal_get(adapter, req_flags, lock_flags);
4545         if (ret < 0)
4546                 goto failed_sbals;
4547
4548         /* this is serialized (we are holding req_queue-lock of adapter) */
4549         if (adapter->req_no == 0)
4550                 adapter->req_no++;
4551         fsf_req->req_id = adapter->req_no++;
4552
4553         zfcp_fsf_req_qtcb_init(fsf_req);
4554
4555         /*
4556          * We hold queue_lock here. Check if QDIOUP is set and let request fail
4557          * if it is not set (see also *_open_qdio and *_close_qdio).
4558          */
4559
4560         if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status)) {
4561                 write_unlock_irqrestore(&req_queue->queue_lock, *lock_flags);
4562                 ret = -EIO;
4563                 goto failed_sbals;
4564         }
4565
4566         if (fsf_req->qtcb) {
4567                 fsf_req->seq_no = adapter->fsf_req_seq_no;
4568                 fsf_req->qtcb->prefix.req_seq_no = adapter->fsf_req_seq_no;
4569         }
4570         fsf_req->sbal_number = 1;
4571         fsf_req->sbal_first = req_queue->free_index;
4572         fsf_req->sbal_curr = req_queue->free_index;
4573         fsf_req->sbale_curr = 1;
4574
4575         if (likely(req_flags & ZFCP_REQ_AUTO_CLEANUP)) {
4576                 fsf_req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
4577         }
4578
4579         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
4580
4581         /* setup common SBALE fields */
4582         sbale[0].addr = (void *) fsf_req->req_id;
4583         sbale[0].flags |= SBAL_FLAGS0_COMMAND;
4584         if (likely(fsf_req->qtcb != NULL)) {
4585                 sbale[1].addr = (void *) fsf_req->qtcb;
4586                 sbale[1].length = sizeof(struct fsf_qtcb);
4587         }
4588
4589         ZFCP_LOG_TRACE("got %i free BUFFERs starting at index %i\n",
4590                        fsf_req->sbal_number, fsf_req->sbal_first);
4591
4592         goto success;
4593
4594  failed_sbals:
4595 /* dequeue new FSF request previously enqueued */
4596         zfcp_fsf_req_free(fsf_req);
4597         fsf_req = NULL;
4598
4599  failed_fsf_req:
4600         write_lock_irqsave(&req_queue->queue_lock, *lock_flags);
4601  success:
4602         *fsf_req_p = fsf_req;
4603         return ret;
4604 }
4605
4606 /*
4607  * function:    zfcp_fsf_req_send
4608  *
4609  * purpose:     start transfer of FSF request via QDIO
4610  *
4611  * returns:     0 - request transfer succesfully started
4612  *              !0 - start of request transfer failed
4613  */
4614 static int zfcp_fsf_req_send(struct zfcp_fsf_req *fsf_req)
4615 {
4616         struct zfcp_adapter *adapter;
4617         struct zfcp_qdio_queue *req_queue;
4618         volatile struct qdio_buffer_element *sbale;
4619         int inc_seq_no;
4620         int new_distance_from_int;
4621         int retval = 0;
4622
4623         adapter = fsf_req->adapter;
4624         req_queue = &adapter->request_queue,
4625
4626
4627         /* FIXME(debug): remove it later */
4628         sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_first, 0);
4629         ZFCP_LOG_DEBUG("SBALE0 flags=0x%x\n", sbale[0].flags);
4630         ZFCP_LOG_TRACE("HEX DUMP OF SBALE1 PAYLOAD:\n");
4631         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE, (char *) sbale[1].addr,
4632                       sbale[1].length);
4633
4634         /* put allocated FSF request into hash table */
4635         spin_lock(&adapter->req_list_lock);
4636         zfcp_reqlist_add(adapter, fsf_req);
4637         spin_unlock(&adapter->req_list_lock);
4638
4639         inc_seq_no = (fsf_req->qtcb != NULL);
4640
4641         ZFCP_LOG_TRACE("request queue of adapter %s: "
4642                        "next free SBAL is %i, %i free SBALs\n",
4643                        zfcp_get_busid_by_adapter(adapter),
4644                        req_queue->free_index,
4645                        atomic_read(&req_queue->free_count));
4646
4647         ZFCP_LOG_DEBUG("calling do_QDIO adapter %s, flags=0x%x, queue_no=%i, "
4648                        "index_in_queue=%i, count=%i, buffers=%p\n",
4649                        zfcp_get_busid_by_adapter(adapter),
4650                        QDIO_FLAG_SYNC_OUTPUT,
4651                        0, fsf_req->sbal_first, fsf_req->sbal_number,
4652                        &req_queue->buffer[fsf_req->sbal_first]);
4653
4654         /*
4655          * adjust the number of free SBALs in request queue as well as
4656          * position of first one
4657          */
4658         atomic_sub(fsf_req->sbal_number, &req_queue->free_count);
4659         ZFCP_LOG_TRACE("free_count=%d\n", atomic_read(&req_queue->free_count));
4660         req_queue->free_index += fsf_req->sbal_number;    /* increase */
4661         req_queue->free_index %= QDIO_MAX_BUFFERS_PER_Q;  /* wrap if needed */
4662         new_distance_from_int = zfcp_qdio_determine_pci(req_queue, fsf_req);
4663
4664         fsf_req->issued = get_clock();
4665
4666         retval = do_QDIO(adapter->ccw_device,
4667                          QDIO_FLAG_SYNC_OUTPUT,
4668                          0, fsf_req->sbal_first, fsf_req->sbal_number, NULL);
4669
4670         if (unlikely(retval)) {
4671                 /* Queues are down..... */
4672                 retval = -EIO;
4673                 del_timer(&fsf_req->timer);
4674                 spin_lock(&adapter->req_list_lock);
4675                 zfcp_reqlist_remove(adapter, fsf_req);
4676                 spin_unlock(&adapter->req_list_lock);
4677                 /* undo changes in request queue made for this request */
4678                 zfcp_qdio_zero_sbals(req_queue->buffer,
4679                                      fsf_req->sbal_first, fsf_req->sbal_number);
4680                 atomic_add(fsf_req->sbal_number, &req_queue->free_count);
4681                 req_queue->free_index -= fsf_req->sbal_number;
4682                 req_queue->free_index += QDIO_MAX_BUFFERS_PER_Q;
4683                 req_queue->free_index %= QDIO_MAX_BUFFERS_PER_Q; /* wrap */
4684                 zfcp_erp_adapter_reopen(adapter, 0, 116, (u64)fsf_req);
4685         } else {
4686                 req_queue->distance_from_int = new_distance_from_int;
4687                 /*
4688                  * increase FSF sequence counter -
4689                  * this must only be done for request successfully enqueued to
4690                  * QDIO this rejected requests may be cleaned up by calling
4691                  * routines  resulting in missing sequence counter values
4692                  * otherwise,
4693                  */
4694
4695                 /* Don't increase for unsolicited status */
4696                 if (inc_seq_no)
4697                         adapter->fsf_req_seq_no++;
4698
4699                 /* count FSF requests pending */
4700                 atomic_inc(&adapter->reqs_active);
4701         }
4702         return retval;
4703 }
4704
4705 #undef ZFCP_LOG_AREA